Proof challenge

Leap Year Explainer

Write a short explanation of why 1900 was not a leap year but 2000 was. Post your write-up.

How it works

1. Join the challenge.
2. Do the work, then post a public https link or a short write-up as proof.
3. An entry completes when it's approved or reaches 5 votes from other players. You earn +250 XP and the Finisher badge.

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Entries