7. Monkeys on Drugs
Addiction has been a severe problem that many humans face. But experimenting on monkeys to find the psychological link to addiction does not sound like a good idea. Yet that is what psychologists G.A Deneau, Yanagita and Seevers intended to do in their experiments.
They exposed macaque monkeys to illegal addictive drugs like morphine, alcohol, cocaine, and amphetamines. Most monkeys ended up harming themselves by seeking the drugs on their own later.