- Elephants communicate in sound waves below the frequency that humans can hear.
- Ancient Egyptians used geometry principles as far back as 3000 BC, using equations to approximate the area of circles among other formulas.
- The most commonly forgotten item for travelers is their toothbrush.
- The shortest war in history lasted for only 38 minutes.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
- Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
- 90% of all volcanic activity occurs in the ocean.
- The Eifel Tower has 2,500,000 rivets.
- Greyhounds can see better than any other dog breed.
- Over 96% of American households purchase bananas at least once a month.
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