Check out the great YouTube channel Technicality and get a special offer from Skillshare here: youtu.be/TjKuu0U2yA4 People have been getting tattoos for thousands of years, but we've never quite been sure why the ink sticks around under our skin. A group of researchers now think they might have the answer. Plus, scientists are on the road to making drought-proof plants! Hosted by: Stefan Chin ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: www.smithsonianmag.com/history/tattoos-144038580/ www.popsci.com/science/article/2013-06/fyi-what-makes-tattoos-permanent www.businessinsider.com/what-happens-to-skin-when-you-get-a-tattoo-2015-6 www.theatlantic.com/health/archive/2014/07/the-real-reason-tattoos-are-permanent/374825/ redo.com.my/wp-content/uploads/2016/12/97_Ferguson_NeodymiumYAG-Laser_BJD_Nd.pdf dx.doi.org/10.1084/jem.20171608 ensia.com/voices/gmos-silver-bullets-and-the-trap-of-reductionist-thinking/ nature.com/articles/doi:10.1038/s41467-018-03231-x ripe.illinois.edu/team/executive-committee science.sciencemag.org/content/354/6314/857