- In 1872 Yellowstone in the US was the world's first national park.
- Whales can't swim backwards.
- A species of moth has the best hearing in the world.
- The US flag has 13 stripes (representing the original 13 states).
- A piece of paper cannot be folded more than 7 times.
- 80% of the world's food crops are pollinated by insects.
- In zero gravity, a candle's flame may appear circular and blue.
- Flightless birds, like the penguin, could once fly.
- The most commonly forgotten item for travelers is their toothbrush.
- Snakes eat their body weight in one year.
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