THIS DAY IN SCIENCE: Brown Dwarf Gliese 229B - Palomar Observatory in 1994

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5 of the World’s Most Dangerous Chemicals

They explode when you touch them. Even a millionth of a gram can kill you. They can even disable you with their horrifying smell. SciShow introduces you to give of the most dangerous chemicals in the world.

Hosted by: Hank Green

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