- Yawns are contagious to dogs as well as humans.
- The word denim comes from 'de Nimes' or from Nimes which is a town in France.
- The smallest country in the world takes up .2 square miles: Vatican City.
- Dolphins can hear underwater sounds from 24km (15miles) away.
- You can only see a rainbow if you have your back to the sun.
- The most common mental illnesses are anxiety and depression.
- The bones of a pigeon weigh less than its feathers.
- Dolphins sleep with one eye open.
- The oldest exposed surface on Earth is New Zealand's south island.
- The Hawaiian alphabet has 13 letters.
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