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Alfred Wegener
Born
Alfred Wegener was a meteorologist and polar explorer when he proposed in 1912, and in his 1915 book The Origin of Continents and Oceans, that the continents had once been joined and drifted apart. He drew on fossils, rock formations and past climates across fields. Geologists largely rejected the idea, partly because he lacked a mechanism and was an outsider; plate tectonics vindicated him in the 1960s, decades after his death in Greenland in 1930.
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Alan Turing
Born
Alan Turing moved from mathematical logic, where his 1936 paper defined computability, to wartime codebreaking at Bletchley Park and the design of early computers. In 1952 he crossed again, into biology, with a paper showing how two interacting chemicals could produce spots and stripes on animals. Developmental biologists largely ignored it for decades before experiments confirmed such patterns.
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Max Delbrück
Born
Max Delbrück trained in theoretical physics with Niels Bohr, then turned to the question of how genes copy themselves, choosing viruses that infect bacteria as the simplest system. With Salvador Luria he designed the 1943 fluctuation test showing that bacterial mutations arise at random, and the informal phage group he led trained a generation of molecular biologists. He shared the 1969 Nobel prize with Luria and Alfred Hershey.
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Erwin Schrödinger
Born
Erwin Schrödinger, a founder of quantum mechanics, gave public lectures in Dublin in 1943 published as What Is Life?, asking how heredity could be explained by physics and suggesting genetic information was stored in an aperiodic crystal. He did no lab biology himself, but the book inspired Francis Crick, James Watson and others to move into molecular biology. It is a rare case of a short book changing who studied a field.
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John von Neumann
John von Neumann worked across pure mathematics, the mathematical foundations of quantum mechanics, game theory, written up with economist Oskar Morgenstern in 1944, and computing, where his 1945 report on the EDVAC described the stored-program design most computers still use. He also worked on the Manhattan Project. His gift was seeing the same mathematical structure in problems that looked unrelated.
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Norbert Wiener
Born
Norbert Wiener, a mathematician, worked during the Second World War on predicting the paths of aircraft for anti-aircraft guns, and saw that feedback in machines resembled feedback in animals and people. His 1948 book Cybernetics founded a field linking engineering, biology, neuroscience and the social sciences. Many ideas in modern control systems and robotics trace back to it.
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Linus Pauling
Born
Linus Pauling applied quantum mechanics to chemical bonding, then carried structural chemistry into biology: in 1949 he and colleagues showed sickle-cell anaemia was caused by an abnormal haemoglobin molecule, the first molecular disease, and in 1951 he proposed the alpha helix in proteins. He won Nobel prizes in chemistry and peace. His later claims for megadoses of vitamin C were not supported by evidence, a caution about expertise travelling too far.
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Dorothy Hodgkin
Born
Dorothy Hodgkin, a chemist, pushed X-ray crystallography into ever larger biological molecules, solving the structures of penicillin in the 1940s, vitamin B12, for which she won the 1964 Nobel prize in chemistry, and finally insulin in 1969 after 35 years of work. Each solved structure had medical uses. She worked with a large team of students and colleagues and early computers to handle the calculations.
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George Gamow
Born
George Gamow, a nuclear physicist and cosmologist who helped develop the theory of how the Big Bang formed light elements, read Watson and Crick's 1953 paper and immediately framed the genetic code as a cryptography problem: how could four DNA bases specify twenty amino acids? His specific proposals were wrong, but the RNA Tie Club he founded brought physicists and biologists together on the question until it was cracked in the 1960s.
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Rosalind Franklin
Born
Rosalind Franklin first made her name studying the microstructure of coal for the British coal industry, then applied X-ray diffraction to DNA at King's College London, producing the images, including Photograph 51, that Watson and Crick used without her knowledge. At Birkbeck she moved on to viruses, leading work with Aaron Klug on the structure of tobacco mosaic virus before her death at 37 in 1958.
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Leo Szilard
Born
Leo Szilard conceived the nuclear chain reaction in 1933 and drafted the 1939 letter, signed by Einstein, that prompted the US atomic bomb programme. Troubled by the weapon, he switched to biology after the war, inventing the chemostat with Aaron Novick to grow bacteria continuously for studying mutation, and campaigned for arms control. He is a clear case of a physicist changing fields for ethical as well as intellectual reasons.
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Francis Crick
Born
Francis Crick studied physics and designed naval mines during the war before moving to biology in his thirties, partly inspired by Schrödinger's What Is Life?. With James Watson, using X-ray data from Rosalind Franklin and Maurice Wilkins, he proposed the double helix in 1953, then shaped the theory of the genetic code. In later life he moved again, to neuroscience and the study of consciousness at the Salk Institute.
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Herbert A. Simon
Born
Herbert Simon began in political science studying how organisations make decisions, developed the idea of bounded rationality that won him the 1978 Nobel prize in economics, and with Allen Newell built some of the first artificial intelligence programs, including the Logic Theorist of 1956. He also helped found cognitive psychology. Few people have won top honours in economics and computer science alike.
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Luis Walter Alvarez
Born
Luis Alvarez won the 1968 Nobel prize in physics for work on particle detectors, then took physics far outside the lab: he used cosmic-ray muons to search for hidden chambers in an Egyptian pyramid, and in 1980, with his geologist son Walter and chemists Frank Asaro and Helen Michel, proposed that an asteroid impact killed the dinosaurs, based on an iridium-rich clay layer. The crater was later found in Mexico.
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Walter Gilbert
Born
Walter Gilbert began as a theoretical physicist at Harvard before switching to molecular biology in the 1960s. With Allan Maxam he developed a chemical method of sequencing DNA in 1977, sharing the 1980 Nobel prize in chemistry with Frederick Sanger and Paul Berg, and he co-founded the biotechnology company Biogen. He was an early advocate of sequencing the entire human genome.
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Frances Arnold
Born
Frances Arnold studied mechanical and aerospace engineering and worked on solar energy policy before training in chemical engineering and turning to enzymes. Rather than designing proteins rationally, she borrowed from evolution, mutating enzymes and selecting improved versions over many rounds. Directed evolution won her a share of the 2018 Nobel prize in chemistry and is now used to make medicines and biofuels.
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Geoffrey Hinton
Born
Geoffrey Hinton studied experimental psychology at Cambridge before a PhD in artificial intelligence at Edinburgh, driven by a question about how the brain learns. His 1986 paper with David Rumelhart and Ronald Williams popularised backpropagation for training neural networks, a method the field had largely abandoned. He shared the 2024 Nobel prize in physics with John Hopfield and has since warned publicly about the risks of AI.
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Demis Hassabis
Born
Demis Hassabis designed video games as a teenager, studied computer science, then took a PhD in cognitive neuroscience on memory and imagination before co-founding DeepMind. His team's AlphaFold system, developed with John Jumper, predicted the structures of nearly all known proteins, a decades-old biology problem, earning the pair a share of the 2024 Nobel prize in chemistry. Games, brains and biology all fed in.
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