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A notched wooden stick from South Africa’s Border Cave dating to 24,000 years ago contains the earliest evidence of humans using poison. The artifact was found in the 1970s, but new chemical analyses conducted by a research team led by Francesco d’Errico of Bordeaux University in France revealed trace amounts of substances from poisonous castor beans. The stick may have been used to apply poison to arrowheads just as a culture of modern-day hunter-gatherers called the San does toda
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