If Humans Shed So Much Dead Skin, How Are Tattoos Permanent?

Your body is constantly throwing off dead skin cells—a million every day. So how come tattoos don’t fall off with them? It turns out, your body’s immune system tries to get rid of the ink under your skin, but in the process, it makes those marks permanent, as this video from TED-Ed explains.

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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/wa4wDTojEIg/if-humans-shed-so-much-dead-skin-how-are-tattoos-perma-1604142129
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