- Nintendo first produced playing cards.
- Kangaroos can't walk backwards.
- The average porcupine has 30,000 spikes.
- Babylonians measured the circumference of a circle as approximately 3 times the diameter, which is fairly close to today's measurement which uses the value of Pi (around 3.14).
- The world's smallest mammal is the bumblebee bat of Thailand.
- Some dinosaurs had tails over 13m (45 feet) long.
- The woodpecker can hammer wood up to 16 times per second.
- Gorillas sleep 14 hours a day.
- The first toothbrush was invented in 1498.
- Octopuses think with their tentacles.
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