They're planning on going where no one has ever gone before.Scientists say it's now possible to drill through Earth's crust and potentially sample Earth's mantle, according to a commentary in the March 24 issue of Nature. The piece came out on the 50th anniversary of the first attempt to drill into the mantle."That has been a long-term ambition of earth scientists," geologist Damon Teagle, one of the commentary's writers, told National Geographic News.Read More... More on Science