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các nhà khoa học cho rằng voi hiếm khi bị ung thư vì... tinh hoàn nóng :D

The ability to avoid cancer is called Peto’s Paradox. The theory (lý thuyết) first emerged from a famed epidemiologist (dịch tễ học) named Richard Peto who made an interesting observation while out on the field. Normally, a larger animal would have more cells and chances for cell division — which would increase their cancer risk. However, Peto noticed two of the largest animals on the planet — whales and elephants — don’t develop cancer.