The Moon's Surface Is Covered in Helium 'Gold'

The Moon's Surface Is Covered in Helium 'Gold'
Buzz Aldrin/NASA via AP

Here's a riddle: What do the Moon, nuclear weapons, clean energy of the future, terrorism, and lung disease all have in common?

The answer is helium-3, a gas that's extremely rare on Earth but 100 million times more abundant on the Moon.

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