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Perhaps the most notorious suppressed invention is the General Motors EV1, subject of the 2006 documentary, Who Killed the Electric Car? The EV1 was the world's first mass-produced electric car, with 800 of them up for lease from GM in the late '90s. GM ended the EV1 line in 1999, stating that consumers weren't happy with the limited driving range of the car's batteries, making it unprofitable to continue production.
The Tuskegee Experiment The Plan: Sometimes referred to as the Tuskegee Syphilis Experiment, the idea was that the United States government was going to monitor the effects of syphilis and perform experiments on those who had a developed form of the disease. That doesn't sound so bad, right?
Thanks to Dan Brown, everyone has one of two responses to the idea that there are hidden codes in ancient works: Either you immediately believe them, because of that mind-blowing Da Vinci Code book, or you immediately mock them, because of that bullshit Da Vinci Code book. The truth is somewhere in the middle. There are, after all, some fairly weird encoded messages that actual academic types have identified.