For four decades his work was regularly published on Life Magazine and Scientific American.

Here are some of my favorite images.

A pair of 90-day-old cow fetuses clearly visible inside an amniotic sac, 1965.

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Fetus in an artificial womb, 1965.

Sheep that survived an atom bomb test are studied for radiation poisoning, 1949.

An anesthetized monkey has its brain activity monitored, 1971.

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A speck of the world’s first plutonium, 1946.

Blood circulating through a heart, 1948.

Research on cigarette smoking and lung cancer, 1953.

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