What makes tattoos permanent? – By Claudia Aguirre – Recommended by Mel

https://ed.ted.com/lessons/what-makes-tattoos-permanent-claudia-aguirre

I love lessons that deal with things that we always think about, yet never considered delving into! Tattoos have been around for 8000 years. Wow! I wonder who invented them back then. I also wonder whether people who watch this will be deterred from having tattoos! I sure am!