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Explore Why Do We Have Leap Years? with 438,406 views, 9,560 likes, and 603 comments. Experience the impact of this video content that has captured audience attention.

So it's February 29th and we have 366 days this year instead of 365- what's the deal with Leap Years? ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Fatima Iqbal, Linnea Boyev, Kathy & Tim Philip, Kevin Bealer, Justin Lentz, Chris Peters, and Philippe von Bergen. ---------- 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: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Hosted by: Hank Green Sources: http://scienceworld.wolfram.com/astronomy/GregorianCalendar.html http://www.britannica.com/science/Babylonian-calendar http://scienceworld.wolfram.com/astronomy/BabylonianCalendar.html https://books.google.com/books?id=5O7SBAAAQBAJ&pg=PA68 http://www.wolframalpha.com/input/?i=lunar+months+in+a+year http://www.wolframalpha.com/input/?i=lunar+month+in+days http://penelope.uchicago.edu/~grout/encyclopaedia_romana/calendar/romancalendar.html http://www.livius.org/articles/concept/pontifex-maximus/ http://www.gutenberg.org/cache/epub/10701/pg10701-images.html http://www.newworldencyclopedia.org/entry/Pontifex_Maximus#Duties http://www.wolframalpha.com/input/?i=%28365.25-365.2425%29*%281582-%28-45%29%29 http://www.biblicalcatholic.com/apologetics/a104.htm http://www.britannica.com/topic/pontifex http://www.wolframalpha.com/input/?i=convert+february+29,+2016+to+the+julian+calendar http://www.wolframalpha.com/input/?i=1%2F%28.2425-.24237%29 http://adsabs.harvard.edu/abs/1992JBAA..102...40M http://www.wolframalpha.com/input/?i=7700*13

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