Today is February 29th, the day that (usually) only comes once every four years. What is a Leap Year, why do we have them and how cool is it that our ancestors figured this out centuries ago?
How does leap day work? Your every-four-years refresher
“I think the significance of the leap year is that it’s a great reminder that the universe is really good at defying our attempts to devise nice and pretty and aesthetically pleasing systems to fit it in”
This video does a good job of illustrating why we leap, and what happens if we don’t!
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J.R. Johnson 
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