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

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

@NASA

explain: https://spaceplace.nasa.gov/leap-year/en/