Why do some years have an extra leap day and what is it for?**NEW: T-Shirts now for sale!** Help support making more videos: http://goo.gl/1WlndAlso check out MinutePhysics' video: http://www.youtube.com/watch?v=53glKEPzElA & SciShow: http://www.youtube.com/watch?v=HnDsXhQHrEw
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