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Chemotherapy is scary and debilitating, but that's nothing compared to cancer. Chemotherapy harnesses dangerous poisons to kill cancer cells, which also harms healthy tissue. However, modern medicine is making great strides in targeting cancer cells exclusively. But there did that idea come from? Strangely, it began with a World War I chemical weapon. Learn about chemotherapy in the TED-Ed lesson. (via Geeks Are Sexy)
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