Here are 5 fun facts:

1. The shortest war in history was between Britain and Zanzibar on August 27, 1896, and lasted only 38 minutes.

2. The Great Wall of China is visible from space, but only under certain conditions.

3. There's a species of jellyfish that's immortal, the Turritopsis dohrnii.

4. The human nose can detect over 1 trillion different scents.

5. Butterflies taste with their feet.