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Charles Darwin

In this Feb. 25, 2012 photo, Professor Stephen Hawking poses beside a lamp titled 'black hole light' presented to him during his visit to the Science Museum in London. A service will be held for him in the same city this June. Hawking, whose brilliant mind ranged across time and space though his body was paralyzed by disease, died in March 2018. Philip Toscano/AP hide caption

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Philip Toscano/AP

Scientists who eat the plants and animals they study are following in the tradition of Charles Darwin. During the voyage of The Beagle, he ate puma ("remarkably like veal in taste"), iguanas, giant tortoises, armadillos. He even accidentally ate part of a bird called a lesser rhea, after spending months trying to catch it so that he could describe the species. Benjamin Arthur for NPR hide caption

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Benjamin Arthur for NPR

William Thomson Kelvin (1824 - 1907) who proposed the absolute or Kelvin temperature scale. He also established the second law of thermo-dynamics. He was brilliant. But he wasn't perfect. W. & D. Downey/Getty Images hide caption

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W. & D. Downey/Getty Images

A zygote begins its journey to expression in the form of a human being. Science Picture Co./Science Faction/Getty Images hide caption

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Science Picture Co./Science Faction/Getty Images