MedlinePlus.gov en Twitter: "Today is #LeapDay! But what does that mean? Why do we add an extra day every 4 years? Let's let @NASA explain: https://t.co/b7wGFJKSn5 https://t.co/LLtzqFTeUG" / Twitter
Today is #LeapDay! But what does that mean? Why do we add an extra day every 4 years?
Let's let
explain:
spaceplace.nasa.gov/leap-year/en/
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