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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.