- The wristwatch was invented in 1904.
- Cats can hear ultrasound.
- In the U.S., there is an official rock, paper, scissors league.
- DFW Airport in Texas is larger than the island of Manhattan.
- The only continent with no active volcanoes is Australia.
- The most valuable nutrients of a potato are its skin.
- The coins thrown into the Trevi fountain in Italy are collected for charity.
- An individual blood cell takes about 60 seconds to make a complete circuit of the body.
- Hippopotamuses have killed more people in Africa than any other animal.
- Ocean algae produces about 75 percent of the world's oxygen.
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