Once every four years we get an extra day in February, known as a Leap Day. Most people know that it's because the Earth isn't exactly perfect in its trip around the sun, so we usually fall behind by a quarter-day every year, and the Leap Day makes up for it.
But if you really want to impress your friends with Leap Day knowledge, check out these two videos from our YouTube science friends, CGPGrey and MinutePhysics. CGPGrey talks about the LeapDay phenomenon, and MinutePhysics discusses the different types of years and why it could all be the result of a giant black hole in the center of the universe.
Here's the one from MinutePhysics, talking about how we define a year:
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