What is a Tsunami? what causes a Tsunami?
- Curious questions, Earth Science, Ocean
- January 23, 2015

Two hundred years ago, people used to think that humans were the smartest animals because we were the only ones who used tools. Then scientists discovered that chimpanzees and other primates used them too. But few people expected to discover a species of bird that uses tools too! What do you think the smartest birds
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