Who’s inside

161 people who changed how we understand the world.

Every person in the series, with the chapter title and big idea from the book. Looking for someone to write a report about? Start here.

  1. Isaac Newton

    1642–1727

    The plague year that changed physics

    Big ideaThe force that drops an apple is the force that holds the Moon in orbit, and it obeys one simple rule.

    In Vol. 1: The Greatest Physicists

  2. Nikola Tesla

    1856–1943

    The man who made electricity spin

    Big ideaAlternating current, which can be sent hundreds of miles and turned into motion with nothing rubbing.

    In Vol. 1: The Greatest Physicists

  3. Marie Curie

    1867–1934

    She boiled down tons of rock to find a glow

    Big ideaSome atoms fall apart on their own and give off energy. She named it radioactivity and found two elements that do it.

    In Vol. 1: The Greatest Physicists

  4. Albert Einstein

    1879–1955

    The patent clerk who bent time

    Big ideaLight passes everyone at the same speed, so space and time must stretch to fit. Mass is frozen energy: E = mc².

    In Vol. 1: The Greatest Physicists

  5. Daniel Bernoulli

    1700–1782

    The doctor who found that fast air pushes less

    Big ideaAlong a smooth flow of fluid, where it moves faster, its pressure is lower. That holds up aircraft and presses racing cars onto the track.

    In Vol. 1: The Greatest Physicists

  6. Galileo Galilei

    1564–1642

    He pointed a spyglass at Jupiter and found four moons

    Big ideaTest ideas by measuring. Without air to slow them, all objects fall at the same rate, and the Earth is not the center of everything.

    In Vol. 1: The Greatest Physicists

  7. Michael Faraday

    1791–1867

    The bookbinder’s apprentice who found electricity in a magnet

    Big ideaMove a magnet near a wire and electricity flows. Most of the world’s electricity still comes from this.

    In Vol. 1: The Greatest Physicists

  8. Max Planck

    1858–1947

    The reluctant revolutionary

    Big ideaEnergy comes in packets. Hot atoms can give off light only in whole packets, and bluer light comes in bigger packets.

    In Vol. 1: The Greatest Physicists

  9. Stephen Hawking

    1942–2018

    The man who made black holes glow

    Big ideaBlack holes are not perfectly black. They leak a faint glow and, given enough time, evaporate.

    In Vol. 1: The Greatest Physicists

  10. Niels Bohr

    1885–1962

    The goalkeeper who built the atom out of stairs

    Big ideaElectrons can sit only on certain rungs around the nucleus. When one jumps down a rung, the atom gives off light of exactly one color.

    In Vol. 1: The Greatest Physicists

  11. James Clerk Maxwell

    1831–1879

    Four equations, and light fell out of them

    Big ideaElectricity and magnetism are one thing, and light is a wave of it. So are radio, X-rays and the signal to your phone.

    In Vol. 1: The Greatest Physicists

  12. Ole Rømer

    1644–1710

    He timed a moon and caught light being slow

    Big ideaLight takes time to travel. When you look at anything, you see it as it was, not as it is.

    In Vol. 1: The Greatest Physicists

  13. Ernest Rutherford

    1871–1937

    The farm boy who found the center of the atom

    Big ideaAn atom is almost entirely empty space, with nearly all its mass packed into a nucleus a hundred thousand times smaller.

    In Vol. 1: The Greatest Physicists

  14. Richard Feynman

    1918–1988

    The physicist who drew the universe in squiggles

    Big ideaEvery way a thing could happen counts a little. Add up all the possibilities and you get what we see.

    In Vol. 1: The Greatest Physicists

  15. Alessandro Volta

    1745–1827

    He stacked coins and wet paper and the world lit up

    Big ideaTwo different metals and something salty between them make electricity flow. Stack enough and you have a battery.

    In Vol. 1: The Greatest Physicists

  16. Benjamin Franklin

    1706–1790

    The printer who pulled a spark from a storm cloud

    Big ideaLightning is electricity, the same stuff as the spark from a doorknob, and a pointed metal rod can lead it safely into the ground.

    In Vol. 1: The Greatest Physicists

  17. Archimedes

    c. 287–212 BC

    The man who could lift the Earth, given a place to stand

    Big ideaWater pushes up on anything in it with a force equal to the weight of the water pushed aside. A long lever multiplies a small push.

    In Vol. 1: The Greatest Physicists

  18. Heinrich Hertz

    1857–1894

    The spark that jumped across the room

    Big ideaMaxwell’s invisible waves are real. You can make them with a spark and catch them with a loop of wire.

    In Vol. 1: The Greatest Physicists

  19. Johannes Kepler

    1571–1630

    He threw out a theory over eight minutes of arc

    Big ideaPlanets move in ellipses, not circles, speeding up near the Sun. Their orbits follow three rules that Newton later explained with gravity.

    In Vol. 1: The Greatest Physicists

  20. Georg Ohm

    1789–1854

    The schoolteacher who measured the push and the flow

    Big ideaCurrent equals voltage divided by resistance. One short rule is behind the design of almost every circuit on Earth.

    In Vol. 1: The Greatest Physicists

  21. J. Robert Oppenheimer

    1904–1967

    The man who ran the project that built the bomb

    Big ideaSplit one uranium nucleus and it throws out neutrons that split more. A chain reaction can release the energy locked in matter, all at once.

    In Vol. 1: The Greatest Physicists

  22. Enrico Fermi

    1901–1954

    He lit the first nuclear fire under a football stand

    Big ideaSlow a neutron down and it is far more likely to be caught by a nucleus. With that, a chain reaction can be controlled.

    In Vol. 1: The Greatest Physicists

  23. James Chadwick

    1891–1974

    He found the particle with no charge, in less than three weeks

    Big ideaThe nucleus holds neutrons: particles as heavy as a proton with no electric charge. They explain atomic weights and make chain reactions possible.

    In Vol. 1: The Greatest Physicists

  24. Henri Becquerel

    1852–1908

    The experiment that worked because the sun did not shine

    Big ideaSome substances give off invisible rays with no help from anything. The atom has an energy source of its own.

    In Vol. 1: The Greatest Physicists

  25. J. J. Thomson

    1856–1940

    The clumsy professor who found the first piece of the atom

    Big ideaAtoms are not the smallest things. Inside every one are electrons, nearly two thousand times lighter than the lightest atom.

    In Vol. 1: The Greatest Physicists

  26. Thomas Edison

    1847–1931

    The inventor who lit Wall Street and lost the current war

    Big ideaA light bulb is useless without a system: a generator, wires, meters and a station to run it. He built the whole system, and then backed the wrong current.

    In Vol. 1: The Greatest Physicists

  27. Carl Friedrich Gauss

    1777–1855

    The schoolboy who, the story goes, found the shortcut through a hundred numbers

    Big ideaBefore you start the arithmetic, look for the pattern underneath it.

    In Vol. 2: Mathematical Masterminds

  28. Blaise Pascal

    1623–1662

    The young man who put the weight of the air to the test

    Big ideaChance can be counted, and a column of air can be weighed.

    In Vol. 2: Mathematical Masterminds

  29. Alan Turing

    1912–1954

    He imagined the computer before anyone could build one

    Big ideaOne machine can do any calculation, if you feed it the right instructions.

    In Vol. 2: Mathematical Masterminds

  30. Leonhard Euler

    1707–1783

    The nearly blind man who worked out almost half his mathematics in his head

    Big ideaCorners minus edges plus faces equals 2, for every flat-faced solid without holes.

    In Vol. 2: Mathematical Masterminds

  31. Paul Erdős

    1913–1996

    The mathematician who lived out of a suitcase

    Big ideaMathematics is done best in company, so go where the problems are.

    In Vol. 2: Mathematical Masterminds

  32. Eratosthenes

    c. 276–194 BC

    He measured the Earth with a well and a stick

    Big ideaTwo shadows, about 800 kilometers apart, are enough to measure a planet.

    In Vol. 2: Mathematical Masterminds

  33. Pythagoras

    c. 570–495 BC

    The theorem is real; the man is mostly fog

    Big ideaIn a right-angled triangle, the squares on the two short sides add up to the square on the long one.

    In Vol. 2: Mathematical Masterminds

  34. Fibonacci

    c. 1170–after 1240

    The customs official’s son who taught Europe to count with zero

    Big ideaTen symbols and the idea of place value can handle any number there is.

    In Vol. 2: Mathematical Masterminds

  35. Euclid

    c. 325–265 BC

    The textbook that lasted two thousand years

    Big ideaStart from a few plain truths and prove everything else, step by step.

    In Vol. 2: Mathematical Masterminds

  36. Girolamo Cardano

    1501–1576

    The gambling doctor who wrote down an impossible number

    Big ideaChance obeys arithmetic, and so, it turns out, does the square root of a negative number.

    In Vol. 2: Mathematical Masterminds

  37. Srinivasa Ramanujan

    1887–1920

    The clerk who mailed a hundred theorems to Cambridge

    Big ideaSome people can see what numbers are doing before anyone can prove it.

    In Vol. 2: Mathematical Masterminds

  38. Pierre-Simon Laplace

    1749–1827

    He worked out the odds that the Sun will rise tomorrow

    Big ideaProbability is common sense turned into arithmetic.

    In Vol. 2: Mathematical Masterminds

  39. Bernhard Riemann

    1826–1866

    The shy pastor’s son who bent space

    Big ideaSpace itself can curve, differently in different places, and we can measure it from inside.

    In Vol. 2: Mathematical Masterminds

  40. Pierre de Fermat

    1601 or 1607–1665

    The judge whose margin riddle lasted more than 350 years

    Big ideaTwo squares can add up to a square; two cubes never add up to a cube.

    In Vol. 2: Mathematical Masterminds

  41. Katherine Johnson

    1918–2020

    The astronaut would not fly until she had checked the numbers

    Big ideaOnce the engine stops, a spacecraft is a thrown stone, and a thrown stone can be calculated.

    In Vol. 2: Mathematical Masterminds

  42. Henri Poincaré

    1854–1912

    He found the limits of prediction, and had to pay for the printing

    Big ideaThree bodies pulling on each other can move in ways no simple formula can predict.

    In Vol. 2: Mathematical Masterminds

  43. Gottfried Wilhelm Leibniz

    1646–1716

    He wrote every number with 0 and 1

    Big ideaTwo symbols are enough to write any number, and the right symbols make hard thinking easy.

    In Vol. 2: Mathematical Masterminds

  44. Ada Lovelace

    1815–1852

    The poet’s daughter who saw what a computer could become

    Big ideaA machine that follows instructions can work on anything you can write as symbols, not just numbers.

    In Vol. 2: Mathematical Masterminds

  45. Terence Tao

    born 1975

    The youngest gold medalist in the history of the Olympiad

    Big ideaAmong the prime numbers, evenly spaced runs of any length you like are waiting to be found.

    In Vol. 2: Mathematical Masterminds

  46. John Nash

    1928–2015

    A short thesis on how rivals really behave

    Big ideaIn any contest with a limited number of choices, there is a way to play, sometimes by mixing moves at random, where nobody gains by changing alone.

    In Vol. 2: Mathematical Masterminds

  47. Georg Cantor

    1845–1918

    He counted past infinity, and found more than one

    Big ideaSome infinities are bigger than others, and there is a way to prove it.

    In Vol. 2: Mathematical Masterminds

  48. John von Neumann

    1903–1957

    He drew the plan that almost every computer still follows

    Big ideaKeep the program in the same memory as the data, and one machine can do any job you can write as a program.

    In Vol. 2: Mathematical Masterminds

  49. Joseph-Louis Lagrange

    1736–1813

    The quiet man who found the parking places in space

    Big ideaAround any two bodies in orbit there are five points where a third can keep pace with them.

    In Vol. 2: Mathematical Masterminds

  50. Steve Jobs

    1955–2011

    The college dropout who made computers friendly

    Big ideaA computer should fit the person, not the other way around.

    In Vol. 3: Tech Titans of Silicon Valley

  51. Bill Gates

    born 1955

    The teenager who decided software was worth money

    Big ideaSoftware is a product in its own right, sold separately from the machine it runs on.

    In Vol. 3: Tech Titans of Silicon Valley

  52. Steve Wozniak

    born 1950

    The engineer who did it with fewer chips

    Big ideaLet the processor do the work and the machine needs fewer parts. Code is almost free to copy, so it often costs less than hardware.

    In Vol. 3: Tech Titans of Silicon Valley

  53. Mark Zuckerberg

    born 1984

    The sophomore who drew a map of who knows whom

    Big ideaWrite down who is friends with whom, and the map itself becomes the product.

    In Vol. 3: Tech Titans of Silicon Valley

  54. Kevin Mitnick

    1963–2023

    The hacker who talked his way in

    Big ideaThe weakest part of any computer system is a person who trusts a stranger.

    In Vol. 3: Tech Titans of Silicon Valley

  55. Linus Torvalds

    born 1969

    The student whose hobby now runs most internet servers

    Big ideaGive away the core of an operating system and let thousands of strangers improve it with you.

    In Vol. 3: Tech Titans of Silicon Valley

  56. Tim Berners-Lee

    born 1955

    The software engineer who gave the Web away

    Big ideaGive every document on every computer an address, a way to fetch it and a way to link it to others.

    In Vol. 3: Tech Titans of Silicon Valley

  57. Grace Hopper

    1906–1992

    The admiral who taught computers English

    Big ideaLet people write instructions in words, and let a program turn the words into the machine’s numbers.

    In Vol. 3: Tech Titans of Silicon Valley

  58. Gordon Moore

    1929–2023

    The chemist who predicted fifty years of computing with one graph

    Big ideaThe number of transistors on a chip doubles every couple of years, and has for half a century.

    In Vol. 3: Tech Titans of Silicon Valley

  59. Robert Noyce

    1927–1990

    The minister’s son who printed a circuit on a chip

    Big ideaMake all the parts of a circuit in one piece of silicon and print the wires on top, the way you print a page.

    In Vol. 3: Tech Titans of Silicon Valley

  60. Bob Kahn and Vint Cerf

    born 1938 and 1943

    Two engineers who taught networks to talk to each other

    Big ideaCut every message into numbered packets, let each one find its own way and reassemble them at the far end.

    In Vol. 3: Tech Titans of Silicon Valley

  61. Edsger Dijkstra

    1930–2002

    The twenty-minute café idea behind how maps find routes

    Big ideaTo find the shortest route, always settle the nearest place you have not yet settled.

    In Vol. 3: Tech Titans of Silicon Valley

  62. Jack Dorsey

    born 1976

    The boy with the scanner who shrank a message to 140 characters

    Big ideaA public message short enough to fit in a text, sent to everyone who chooses to listen.

    In Vol. 3: Tech Titans of Silicon Valley

  63. Peter Thiel

    born 1967

    The chess player who moved money by infrared

    Big ideaPaying online is changing two numbers in a ledger. The hard part is proving who asked.

    In Vol. 3: Tech Titans of Silicon Valley

  64. Elon Musk

    born 1971

    The man who decided rockets should land

    Big ideaA rocket that flies back and lands can be used again, and a car can run on a floor full of batteries.

    In Vol. 3: Tech Titans of Silicon Valley

  65. Marc Andreessen

    born 1971

    The student who put pictures on the Web

    Big ideaA browser that shows images beside the words, and that ordinary people could download and use.

    In Vol. 3: Tech Titans of Silicon Valley

  66. Shawn Fanning

    born 1980

    The freshman whose music program emptied the record shops

    Big ideaKeep one list of who has which file, and let people’s computers trade directly with each other.

    In Vol. 3: Tech Titans of Silicon Valley

  67. James Gosling

    born 1955

    The programmer who built an imaginary computer

    Big ideaCompile a program once, for a machine that does not exist, and let every real machine pretend to be it.

    In Vol. 3: Tech Titans of Silicon Valley

  68. Guido van Rossum

    born 1956

    The Christmas hobby that became one of the world’s most popular languages

    Big ideaA programming language should read like the writing of a clear thinker, with nothing in the way.

    In Vol. 3: Tech Titans of Silicon Valley

  69. Michael Dell

    born 1965

    The pre-med student who built computers to order in his dorm

    Big ideaBuild each computer only after someone has ordered it, from standard parts that all fit together.

    In Vol. 3: Tech Titans of Silicon Valley

  70. Richard Stallman

    born 1953

    The programmer who would not sign the agreement

    Big ideaSoftware should come with the freedom to study, change and share it, and a license can make that freedom stick.

    In Vol. 3: Tech Titans of Silicon Valley

  71. Jeff Bezos

    born 1964

    The bookseller who started renting out his computers

    Big ideaComputing can be rented by the hour over the internet, like electricity, instead of bought by the box.

    In Vol. 3: Tech Titans of Silicon Valley

  72. Larry Page and Sergey Brin

    both born 1973

    Two graduate students who let the Web vote on itself

    Big ideaA link from one page to another is a vote, and votes from important pages count more.

    In Vol. 3: Tech Titans of Silicon Valley

  73. Jimmy Wales

    born 1966

    The options trader who let everyone edit the encyclopedia

    Big ideaLet anyone change any page, keep every version, and trust the crowd to fix mistakes faster than it makes them.

    In Vol. 3: Tech Titans of Silicon Valley

  74. Larry Ellison

    born 1944

    The dropout who sold IBM’s idea before IBM did

    Big ideaKeep information in tables, link them by shared columns, and ask for what you want in a language that reads a little like English.

    In Vol. 3: Tech Titans of Silicon Valley

  75. Alfred Nobel

    1833–1896

    The man who read his own obituary

    Big ideaAn explosion is an ordinary chemical reaction in a great hurry, and even that can be tamed.

    In Vol. 4: Explosive Chemists

  76. Antoine Lavoisier

    1743–1794

    The tax collector who weighed fire

    Big ideaIn a chemical reaction nothing is lost and nothing is created. Weigh everything, and the books balance.

    In Vol. 4: Explosive Chemists

  77. Dmitri Mendeleev

    1834–1907

    The man who knew elements nobody had seen

    Big ideaLine the elements up by weight and their properties repeat, like the days of the week.

    In Vol. 4: Explosive Chemists

  78. Robert Boyle

    1627–1691

    The earl’s son who pumped a jar empty

    Big ideaSqueeze a gas into half the space and it pushes back twice as hard.

    In Vol. 4: Explosive Chemists

  79. Adolf von Baeyer

    1835–1917

    The chemist who put the blue in blue jeans

    Big ideaA color is a molecule. Work out the molecule and you can build the color in a factory.

    In Vol. 4: Explosive Chemists

  80. Fritz Haber

    1868–1934

    The man who fed the world and poisoned the trenches

    Big ideaPull nitrogen out of the air and turn it into fertilizer. About half the people alive eat because of it.

    In Vol. 4: Explosive Chemists

  81. Rosalind Franklin

    1920–1958

    The photograph that showed the shape of life

    Big ideaFire X-rays through a crystal and the pattern they leave tells you how the molecule is built.

    In Vol. 4: Explosive Chemists

  82. Mario Molina

    1943–2020

    The chemist who asked where the spray cans went

    Big ideaA gas so stable that nothing on Earth destroys it will rise until the Sun breaks it apart, and then its chlorine eats the ozone layer.

    In Vol. 4: Explosive Chemists

  83. Alice Ball

    1892–1916

    The chemist who turned a useless oil into a cure

    Big ideaA medicine your body cannot absorb is no medicine. Change the molecule, and it works.

    In Vol. 4: Explosive Chemists

  84. Linus Pauling

    1901–1994

    The man who worked out what holds atoms together

    Big ideaA chemical bond is a tug of war over electrons, and you can put a number on how hard each atom pulls.

    In Vol. 4: Explosive Chemists

  85. Dorothy Hodgkin

    1910–1994

    The Oxford housewife who saw the shape of penicillin

    Big ideaA molecule is too small to see, but the shadows it casts in X-rays can be turned into a map of its atoms.

    In Vol. 4: Explosive Chemists

  86. Percy Julian

    1899–1975

    The chemist who made medicine out of beans

    Big ideaNature builds its steroid hormones on one frame of four rings. Find a cheap plant that makes the frame and you can build the rest.

    In Vol. 4: Explosive Chemists

  87. Humphry Davy

    1778–1829

    The showman who pulled new metals out of a battery

    Big ideaElectricity can tear apart compounds that no furnace can touch, and inside them are elements nobody has seen.

    In Vol. 4: Explosive Chemists

  88. August Kekulé

    1829–1896

    The architect who dreamed a snake biting its tail

    Big ideaAtoms in a molecule are joined in a definite pattern, and six carbon atoms can close into a ring.

    In Vol. 4: Explosive Chemists

  89. Louis Pasteur

    1822–1895

    The chemist who found left-handed molecules

    Big ideaMolecules come in left-handed and right-handed forms, and living things can tell the difference.

    In Vol. 4: Explosive Chemists

  90. Gertrude Elion

    1918–1999

    The drug designer who built counterfeit keys

    Big ideaBuild a fake copy of a cell’s building block, and a cancer cell or virus will pick it up and jam itself.

    In Vol. 4: Explosive Chemists

  91. Svante Arrhenius

    1859–1927

    The man who first did the arithmetic on carbon dioxide

    Big ideaCarbon dioxide in the air traps heat, and the more of it there is, the warmer the ground.

    In Vol. 4: Explosive Chemists

  92. Leo Baekeland

    1863–1944

    The cobbler’s son who invented the first fully synthetic plastic

    Big ideaSmall molecules can be linked into chains and nets to make a material that exists nowhere in nature.

    In Vol. 4: Explosive Chemists

  93. Carl Scheele

    1742–1786

    The apothecary who found oxygen and lost the credit

    Big ideaAir is a mixture, and about a fifth of it is a gas that makes fire blaze and keeps animals alive.

    In Vol. 4: Explosive Chemists

  94. Amedeo Avogadro

    1776–1856

    The lawyer who learned to count molecules

    Big ideaEqual volumes of any two gases, at the same temperature and pressure, hold the same number of molecules.

    In Vol. 4: Explosive Chemists

  95. Tu Youyou

    born 1930

    The pharmacist who read a 1,600-year-old prescription correctly

    Big ideaA molecule from a common weed kills the malaria parasite, and Tu found it by keeping the extraction cool.

    In Vol. 4: Explosive Chemists

  96. Stephanie Kwolek

    1923–2014

    The chemist who would not pour the cloudy liquid away

    Big ideaLine up stiff polymer chains side by side and the fiber they make is five times stronger than steel for its weight.

    In Vol. 4: Explosive Chemists

  97. Henry Cavendish

    1731–1810

    The shyest man in science, who found the lightest gas

    Big ideaA gas fourteen times lighter than air burns with oxygen and leaves nothing behind but water.

    In Vol. 4: Explosive Chemists

  98. Ahmed Zewail

    1946–2016

    The chemist who filmed a bond breaking

    Big ideaFlash a laser twice, less than a trillionth of a second apart, and you can photograph atoms in the act of changing partners.

    In Vol. 4: Explosive Chemists

  99. Charles Darwin

    1809–1882

    Twenty years of silence, then a letter from the tropics

    Big ideaLiving things change over generations because the ones that fit their surroundings best leave the most offspring.

    In Vol. 5: Brilliant Biologists

  100. Gregor Mendel

    1822–1884

    The monk who counted about 28,000 pea plants

    Big ideaTraits are passed on in separate units that do not blend, and they follow the rules of chance.

    In Vol. 5: Brilliant Biologists

  101. Jane Goodall

    1934–2025

    The secretary who went to live with chimpanzees

    Big ideaChimpanzees make tools, have personalities and pass habits down the generations. The line between us and them is thinner than anyone thought.

    In Vol. 5: Brilliant Biologists

  102. Rachel Carson

    1907–1964

    The writer who heard the birds go quiet

    Big ideaA poison sprayed on a field does not stay there. It climbs the food chain and ends up in the eagle, and in you.

    In Vol. 5: Brilliant Biologists

  103. Carl Linnaeus

    1707–1778

    The man who gave every living thing two names

    Big ideaSort all of life into nested groups, and give every species one name of two words that works in every language.

    In Vol. 5: Brilliant Biologists

  104. Barbara McClintock

    1902–1992

    The woman who watched genes jump in a cornfield

    Big ideaGenes are not nailed to one spot on a chromosome. Some of them move, and when they land they can switch other genes on and off.

    In Vol. 5: Brilliant Biologists

  105. Alexander von Humboldt

    1769–1859

    The man who climbed a volcano and saw the whole planet

    Big ideaClimate, soil, plants, animals and people are one connected system. Change one and the others move.

    In Vol. 5: Brilliant Biologists

  106. Alfred Russel Wallace

    1823–1913

    The collector who lost everything at sea and started again

    Big ideaWhere an animal lives tells you where it came from. Barriers such as deep water and high mountains divide the living world into regions.

    In Vol. 5: Brilliant Biologists

  107. Antonie van Leeuwenhoek

    1632–1723

    The cloth merchant who found a zoo in his own mouth

    Big ideaA drop of water and a scraping from your teeth are full of living things too small to see, and your own blood is full of tiny living cells.

    In Vol. 5: Brilliant Biologists

  108. E. O. Wilson

    1929–2021

    The boy with one good eye who learned to speak ant

    Big ideaAn ant colony acts like one animal with thousands of bodies, run by smells. Understanding it tells you how societies work, and why life needs room.

    In Vol. 5: Brilliant Biologists

  109. Dian Fossey

    1932–1985

    The woman who lived alone in the mountain forest

    Big ideaGorillas are shy, gentle family animals, and the way to learn about them is to behave like one.

    In Vol. 5: Brilliant Biologists

  110. George Washington Carver

    c. 1864–1943

    The plant doctor who taught the South to rest its soil

    Big ideaPeanuts and beans carry bacteria in their roots that pull fertilizer out of the air. Plant them between cotton crops and worn-out land comes back.

    In Vol. 5: Brilliant Biologists

  111. Lynn Margulis

    1938–2011

    The biologist who found bacteria living inside you

    Big ideaThe power plants inside your cells were once free-living bacteria. Complex life began when one cell swallowed another and did not digest it.

    In Vol. 5: Brilliant Biologists

  112. Thomas Hunt Morgan

    1866–1945

    The skeptic who found a white-eyed fly

    Big ideaGenes sit in a line along chromosomes, and you can map where each one is by breeding fruit flies.

    In Vol. 5: Brilliant Biologists

  113. Wangari Maathai

    1940–2011

    The woman whose movement planted tens of millions of trees

    Big ideaForests help hold the soil on slopes and keep rain soaking in. Where they are cut, soil washes away and streams often suffer; planting trees can help bring them back.

    In Vol. 5: Brilliant Biologists

  114. David Attenborough

    born 1926

    The man who showed the whole planet to the whole planet

    Big ideaFilm the living world honestly, with the science right and the wonder left in, and people will care what happens to it.

    In Vol. 5: Brilliant Biologists

  115. Robert Hooke

    1635–1703

    The man who drew a flea the size of a cat

    Big ideaPut a lens between your eye and the world and there is a second world underneath, full of structure nobody had suspected. He named its building blocks cells.

    In Vol. 5: Brilliant Biologists

  116. Mary Anning

    1799–1847

    The girl who dug sea monsters out of a crumbling cliff

    Big ideaThe layers in a cliff are pages of the Earth’s history, and the bones in them belong to animals that no longer exist.

    In Vol. 5: Brilliant Biologists

  117. James Watson and Francis Crick

    1928–2025 and 1916–2004

    Two men, a borrowed photograph and a twisted ladder

    Big ideaDNA is a twisted ladder whose rungs come in matched pairs, so each half can rebuild the other. That is how living things copy themselves.

    In Vol. 5: Brilliant Biologists

  118. Charles Henry Turner

    1867–1923

    The high-school teacher who proved that insects can learn

    Big ideaInsects are not little machines. Turner found evidence that bees see color, that moths hear, that cockroaches learn mazes and that ants steer by sight.

    In Vol. 5: Brilliant Biologists

  119. Alexander Fleming

    1881–1955

    The untidy laboratory that saved millions

    Big ideaA common mold makes a substance that kills bacteria and leaves human cells alone.

    In Vol. 6: Medical Pioneers

  120. Edward Jenner

    1749–1823

    The country doctor who listened to the milkmaids

    Big ideaShow the body something harmless that looks like a deadly germ, and it learns to fight the real thing. Every vaccine since works this way.

    In Vol. 6: Medical Pioneers

  121. Florence Nightingale

    1820–1910

    The nurse who beat the army with a diagram

    Big ideaCount the deaths, work out the rate and draw it so a general can see it in one glance. Numbers save lives.

    In Vol. 6: Medical Pioneers

  122. Jonas Salk

    1914–1995

    The summer the swimming pools reopened

    Big ideaA virus killed with chemicals keeps its shape, so the body can learn to fight it without ever being infected.

    In Vol. 6: Medical Pioneers

  123. Hippocrates

    c. 460–370 BC

    The doctors who wrote down their failures

    Big ideaDisease has natural causes. Watch the patient, write down what you see and learn from what happens.

    In Vol. 6: Medical Pioneers

  124. Elizabeth Blackwell

    1821–1910

    Admitted to medical school as a joke

    Big ideaHalf of all patients are women, and many of them would rather be treated by one. In 1849 the United States had exactly one woman with a medical degree.

    In Vol. 6: Medical Pioneers

  125. Joseph Lister

    1827–1912

    The surgeon who went to war against the invisible

    Big ideaWounds go bad because living germs get into them. Kill the germs and the wound heals.

    In Vol. 6: Medical Pioneers

  126. Virginia Apgar

    1909–1974

    Five checks, ten points, one minute

    Big ideaGive every newborn the same five quick checks and a score out of ten, so nobody has to guess how a baby is doing.

    In Vol. 6: Medical Pioneers

  127. William Harvey

    1578–1657

    The king’s doctor who did the arithmetic on blood

    Big ideaThe heart is a pump, and the blood goes round and round. Count your pulse, do Harvey’s math and see why.

    In Vol. 6: Medical Pioneers

  128. Andreas Vesalius

    1514–1564

    The student who stole a skeleton by night

    Big ideaIf you want to know what is inside a human body, open one and look. Do not take a dead Greek’s word for it.

    In Vol. 6: Medical Pioneers

  129. Daniel Hale Williams

    1856–1931

    The barber’s son who stitched the sac around a beating heart

    Big ideaThe chest is not off-limits. A surgeon with clean hands and steady nerves can mend a wound next to a beating heart.

    In Vol. 6: Medical Pioneers

  130. Christiaan Barnard

    1922–2001

    Eighteen days with another person’s heart

    Big ideaA heart can be moved from one body to another and beat on. The hard part is persuading the new body to let it stay.

    In Vol. 6: Medical Pioneers

  131. Ignaz Semmelweis

    1818–1865

    The doctor who found the killer on his own hands

    Big ideaDoctors were carrying death from the autopsy room to the maternity ward on their hands. Washing them cut the deaths sharply.

    In Vol. 6: Medical Pioneers

  132. Charles Drew

    1904–1950

    The man who taught blood to travel

    Big ideaTake the cells out of blood and the yellow liquid left behind can be stored, shipped and given to almost anyone in an emergency.

    In Vol. 6: Medical Pioneers

  133. Helen Taussig

    1898–1986

    The deaf doctor who listened to hearts with her fingers

    Big ideaMany “blue babies” are blue because too little blood reaches the lungs. Build a detour and send more.

    In Vol. 6: Medical Pioneers

  134. Rebecca Lee Crumpler

    1831–1895

    The doctor whose face nobody remembers

    Big ideaTeach a mother how to keep her children well and you have done more than a dozen doctors who arrive when they are sick.

    In Vol. 6: Medical Pioneers

  135. Harvey Cushing

    1869–1939

    The surgeon who made the brain a place you could go

    Big ideaBrain surgery kills when it is fast and bloody. Go slow, stop every bleed, write everything down, and most patients live.

    In Vol. 6: Medical Pioneers

  136. Paul Ehrlich

    1854–1915

    Hundreds of tries for one magic bullet

    Big ideaA drug can be a bullet that hits the germ and misses the patient. You find it by testing, and testing, and testing.

    In Vol. 6: Medical Pioneers

  137. Galen

    c. AD 129–216

    The gladiators’ doctor who was believed for 1,300 years, and wrong

    Big ideaExperiment on the living body to find out what each part does. Then, unfortunately, write it all down so well that nobody checks it for a thousand years.

    In Vol. 6: Medical Pioneers

  138. Ibn Sina (Avicenna)

    c. 980–1037

    The teenager who cured a king and wrote the book Europe studied for 500 years

    Big ideaA medicine is only proven when it is tested, on people, in the right way. He wrote some of the first rules.

    In Vol. 6: Medical Pioneers

  139. Isambard Kingdom Brunel

    1806–1859

    The engineer who believed bigger was cheaper

    Big ideaDouble a ship’s size and its cargo grows eight times while its drag grows only about four. Build big.

    In Vol. 7: Extraordinary Engineers

  140. Gustave Eiffel

    1832–1923

    The man who let the wind draw his tower

    Big ideaShape a tall structure so the wind’s push is met by its own spread, and iron can stand 300 meters high.

    In Vol. 7: Extraordinary Engineers

  141. James Watt

    1736–1819

    The repairman who noticed where the heat was going

    Big ideaKeep the cylinder hot and cool the steam somewhere else. The engine burns a third to a quarter of the coal.

    In Vol. 7: Extraordinary Engineers

  142. Fazlur Rahman Khan

    1929–1982

    The engineer who turned skyscrapers into tubes

    Big ideaMake the outside walls do the work. A hollow tube resists wind far better than a frame of columns.

    In Vol. 7: Extraordinary Engineers

  143. Emily Warren Roebling

    1843–1903

    The woman who carried the Brooklyn Bridge in her head

    Big ideaCables pull, towers push. Give each material the job it is good at and you can hang a road across a river.

    In Vol. 7: Extraordinary Engineers

  144. Wernher von Braun

    1912–1977

    The rocket builder who worked for two flags

    Big ideaA rocket does not push against the air. It throws hot gas backward, and the gas throws the rocket forward.

    In Vol. 7: Extraordinary Engineers

  145. George Stephenson

    1781–1848

    The pitman who could not read until he was eighteen

    Big ideaReplace the big boiler flue with twenty-five small tubes and the fire gets about four times as much surface to heat the water.

    In Vol. 7: Extraordinary Engineers

  146. Lillian Gilbreth

    1878–1972

    The mother of twelve who counted every step

    Big ideaFilm a job, break it into its smallest motions, and throw away the ones that do nothing.

    In Vol. 7: Extraordinary Engineers

  147. Sergei Korolev

    1907–1966

    The prisoner whose name was a state secret

    Big ideaThrow something fast enough sideways and it falls around the Earth forever. That is an orbit.

    In Vol. 7: Extraordinary Engineers

  148. John Smeaton

    1724–1792

    The man who built a lighthouse like an oak tree

    Big ideaLock every stone into its neighbors and a tower of blocks becomes one solid thing that the sea cannot pull apart.

    In Vol. 7: Extraordinary Engineers

  149. Hertha Ayrton

    1854–1923

    The woman who found out why the lights hissed

    Big ideaSmall whirlpools of fluid can build the ripples on a beach, and she hoped well-aimed pulses of air could push lingering poison gas out of a trench or dugout.

    In Vol. 7: Extraordinary Engineers

  150. Claude Shannon

    1916–2001

    The juggler who measured information

    Big ideaEvery message, picture or song can be counted in yes-or-no answers. One answer is a bit.

    In Vol. 7: Extraordinary Engineers

  151. Norbert Rillieux

    1806–1894

    The engineer who boiled sugar with used steam

    Big ideaSteam rising off one boiling pan still carries almost all its heat. Catch it and use it to boil the next pan.

    In Vol. 7: Extraordinary Engineers

  152. Henry Ford

    1863–1947

    The farm boy who made the work come to the worker

    Big ideaKeep the worker still and move the car past him. Twelve and a half hours of assembly became ninety-three minutes.

    In Vol. 7: Extraordinary Engineers

  153. Marc Isambard Brunel

    1769–1849

    The refugee who, the story goes, learned tunneling from a worm

    Big ideaDig a little, line the hole behind you, push forward. A shipworm does it in wood; a shield does it under a river.

    In Vol. 7: Extraordinary Engineers

  154. Granville Woods

    1856–1910

    The inventor who talked to a moving train

    Big ideaA changing current in one wire stirs a current in a nearby wire without touching it. That gap can carry a message to a train at full speed.

    In Vol. 7: Extraordinary Engineers

  155. Ellen Swallow Richards

    1842–1911

    The chemist who mapped a whole state’s dirty water

    Big ideaSalt in a river tells you how far you are from the sea. Too much salt tells you someone’s sewage is in it.

    In Vol. 7: Extraordinary Engineers

  156. Rudolf Diesel

    1858–1913

    The engine that lights its own fire, and the man who vanished at sea

    Big ideaSqueeze air hard enough and it gets hot enough to set fuel alight by itself. The harder the squeeze, the less fuel is wasted.

    In Vol. 7: Extraordinary Engineers

  157. Mokshagundam Visvesvaraya

    1861–1962

    The engineer whose birthday is Engineers’ Day

    Big ideaA dam turns four months of monsoon into twelve months of water, and a gate can open itself with no one watching.

    In Vol. 7: Extraordinary Engineers

  158. Lee de Forest

    1873–1961

    The man who put a gate in a beam of electrons

    Big ideaA tiny voltage on a wire grid can throttle a large flow of electrons. A weak signal becomes a strong one.

    In Vol. 7: Extraordinary Engineers

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