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There is an odd dichotomy in human exploration: While we think nothing of going up — jetting through the skies six miles up, skydiving from the edge of space, or launching humans hundreds or thousands of miles into deep space — going down has always proven rather difficult. To this day, the deepest humankind has ever gone is just 7.6 miles below our feet — or just 0.2% of the distance to the Earth’s core. It’s not that we don’t want to go deeper — and there are huge scientific and commercial gains to be made if we could go deeper — but, try as we might, despite millennia of developing ever more advanced tools and materials, and exploration that has taken spacecraft to the edge of the Solar System, the subterranean depths remain firmly off-limits. Why?
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