Everyone does it -- using oil, that is. But how much do we have left? How do scientists find it? And where are they looking for it now that the easiest pickings have been taken? Hank has the answers to the how, why and how much of oil. Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: dftba.com/artist/52/SciShow -- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com