Disturbing Secret Science Experiments That Actually Happened

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Science discoveries and inventions have provided us tremendous benefits. Doctors have taken advantage of X-ray machines to diagnose their patients easily, we use air-conditioners to sleep soundly at night, and pasteurization processes helps keep our food safe.
We acknowledge scientists as real-life heroes. But since they are humans just like us, they are also likely to make mistakes with their experiments and studies.
Here are some real-life science experiments that went wrong. Some of them are so disturbing that science wishes they never happened.