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(Reinhard Dirscherl / Alamy)

Extreme Jellyfish

There are some 2,000 species of jellyfish. Some are tasty, others will kill you with the tap of a tentacle. Here are nine varieties that really stand out

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Jellyfish under West Antarctic ice sheet
(Maura McCarthy)
NASA scientists recently stuck a camera beneath a 600-foot-thick West Antarctic ice sheet, expecting to find no signs of life. But in the frigid water they saw what appeared to be the tentacle of a foot-long jellyfish.

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