By Marcelo Gleiser
Originally published on Wed February 8, 2012 9:23 am
Outer space is not the only frontier. There is also inner space, pockets of unexplored regions within our own Earth. Granted, they are becoming very scarce, at least those that are accessible by foot or by boat or by flying machine. Fortunately, there are still unexplored subsurface worlds, deep under the ocean, deep within caves, or deep under the ice. And what lurks within them may be the stuff of our wildest dreams.
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