How Many Calories are on a Smudgy Screen?

Ho! Ho! Ho! Subscribe to Vsauce: http://bit.ly/POIaN7 http://www.Twitter.com/Tweetsauce http://www.Facebook.com/VsauceGaming http://www.YouTube.com/Vsauce2 http://www.YouTube.com/Vsauce3 How Stuff Works on Figerprints: http://science.howstuffworks.com/fingerprinting2.htm Fingerprints on Wikipedia: http://en.wikipedia.org/wiki/Fingerprint Twins and DNA: http://www.nytimes.com/2008/03/11/health/11real.html da Vinci fingerprint on painting: http://www.leonardodavinci.net/portrait-of-ginevra-de-benci.jsp What makes up a latent fingerprint: http://www.chm.bris.ac.uk/webprojects2002/thomson/fingerprints2.htm What makes up sebum: http://en.wikipedia.org/wiki/Sebaceous_gland#Composition Losing your fingerprints: http://www.scientificamerican.com/article.cfm?id=lose-your-fingerprints Adermatoglyphia: http://www.handresearch.com/news/adermatoglyphia-genetic-no-fingerprints-disease.htm Koala fingerprints vs human fingerprints: http://io9.com/5798400/koalas-have-exactly-the-same-fingerprints-as-humans surface area of an iPhone5: http://appadvice.com/appnn/2012/09/op-ed-iphone-5-or-iphone-why Great smudge photography: http://chrisglass.com/album/2010/04/03/touched/ Breast milk as a