Forget about nuclear winter. Humans are resilient. We will survive. So how many nukes will it take to destroy every single human being in the planet, on first blast? Here's the calculation in graphic form—with a surprising answer:

The first part of the graphic—created by David McCandless—shows how much space is actually used by the entire population. According to the Guardian Datablog and the Bulletin of Atomic Scientists, only 12.5% of the planet's surface is actually occupied by humans. A total of 18,617,500 square kilometers.

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