If, like us, you've got a bit of ink on you, you'll find this video particularly interesting. Did you know that the first mummified remains with tattoos were discovered in Peru?
More importantly however, this video goes into the science behind how tattooing actually works. TEDEd produced this lovely little video which details all the intricacies that go into tattooing, including your skin regeneration, the pigmentation process and even where the first tattoo pens came from.
Very interesting stuff, altogether.