The medical student who discovered heparin by accident
You can thank a sleep-deprived second-year medical student for the fact that your blood doesn't instantly clot into a solid brick during open-heart surgery. In 1916, Jay McLean was tasked with finding pro-coagulants in canine liver tissue, but he completely failed his assignment and accidentally isolated heparin instead, discovering the world's most vital anticoagulant.

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