If you want to vaporize the Earth—and, really, who doesn't?—then you will need about 2 x 1032 Joules. A Joule is a tiny amount of energy, but 200,000,000,000,000,000,000,000,000,000,000 of them add up.

But it's hard to grasp what that really means, so maybe we need to translate this into more understandable units. Hey, got a one-megaton nuclear bomb handy? You'll need 57 quadrillion (5.7 x 1016) more if you want to blow up the planet.

Yikes. The total nuclear arsenal of every nation on Earth combined is probably somewhat less than 100,000 megatons, so we come up a bit short.