Unveiling History's Most Gruesome Experiments Ever Conducted

Stanford Prison Experiment

In 1971, the simulated experiment assigned people roles as prisoners or guards, causing psychological distress and escalating into violence

Tuskegee Syphilis Experiment

From 1932 to 1972, syphilis treatment of subjects was withheld, for observational purposes causing many deaths

Unit 731

A research facility that, between 1937 and 1945, the Imperial Japanese Army subjected inmates to horrifying experiments

The Monster Study

Conducted in 1939 at the University of Iowa, this study aimed to induce stuttering in orphans through negative speech therapy

Aversion Therapy Experiment

Gay people were the subject of the experiments in the 1960s and 1970s that attempted to alter their sexual orientation