12. Elephant Tranquilizer Overdose
In 1962, researchers injected Tusko, a 14-year-old male elephant at the Oklahoma City Zoo, with 297 milligrams of LSD to study its effects. Within minutes, Tusko collapsed and died after an hour and forty minutes. The experiment, intended to induce a state known as “musth,” led to debates on animal rights and experimental boundaries. The incident remains a controversial chapter in scientific history. (theguardian.com)