How low can you go?

Earlier this year, Nicole Yamase explored the bottom of the
Challenger Deep, the deepest place in the ocean, where few people
have ever been. The rest of the seafloor is almost as mysterious —
80 percent remains unmapped — but the few glimpses scientists have
gotten have completely revolutionized our understanding of the
planet. For more, go to http://vox.com/unexplainable It’s a great
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