Your body is a wonderland, and next time you doubt that simple fact which John Mayer taught us all freshman year of high school, peep your oldest ink and rewatch this video about the science of tattoos. Basically, the reason tattoos can exist your whole life isn’t just because needles deposit ink into very deep layers of skin. It’s because the invasion of alien cells deep inside your skin triggers your body’s infection-fighting mode. And the cells sent to fight infection and the cells sent to fight inflammation basically fight the ink forever and ever, holding your tattoo in place until you die. Shit (and by shit, we mean science) is cray, right? Check out an adorably animated video on the science of tattoos above, unless you’re high, because then you will definitely wig out.
[h/t The Atlantic]