One of the most controversial medical procedures in history

Uncover the history of the lobotomy, and find out why it's considered one of the most controversial procedures of the 20th century.

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In 1935, researchers found that after removing the frontal lobes of two chimps, they no longer experienced frustration or anxiety. Neurologist Egas Moniz believed that replicating this in humans could cure mental illness— leading to one of the most controversial and destructive medical treatments of the 20th century: the lobotomy.