Since their introduction in 1978, Lego's Minifigs have, um, reproduced at a rapid rate. In fact, the toymaker has been making the little fellas at such a pace that they'll outnumber humans by 2019.
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As of 2006, there were 4 billion Minifigs in the world; projecting forward both human and Lego populations suggests that tiny plastic men will outnumber us by 2019. Imagine that: a world where there are more Minifigs than fellow homosapiens. That's our kind of world. [XKCD]