Secret Documents Show Companies Hid Dangers Of 'Forever Chemicals' For A Decade

A new study shows that leading manufacturers knew about the toxicity of "forever chemicals" and intentionally kept the information from the public. Science Alert notes that for at least 21 years, company leaders at DuPont – the maker of Teflon – and 3M – the maker of Scotchgard – sat on concerning results.

More in Why scientists are putting tiny pants on poisonous tree frogs, and more of today's top videos (5 of 8)

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Why scientists in South America are putting tiny pants on tiny poisonous tree frogs, watch a…