Not really botanically related, but stumbled across this while procrastinating in the library. It’s a study on the evolution of the PRNP gene in cannibals in Papua New Guinea. The South Fore people in the country have a tradition of consuming their deceased relatives at mortuary feasts. They are also plagued with a disease called Kuru, which is akin to the mad cow disease, leading to the degeneration of the brain tissue eventually leading to death. It seems, a variant of the PRNP gene has evolved in this these people which protects them against Kuru.

Okay, its not an ideal candidate for extolling the virtues of evolution to naysayers, but fascinating nonetheless!