1. Gecko feet have millions of tiny hairs that stick to surfaces with a special chemical bins and let them climb walls and hang one by just one toe.
2. The term "astronaut" comes from Greek words that mean "star" and "sailor".
3. The Nile crocodile can hold its breath underwater for up to 2 hours while waiting for its prey.
4. Jellyfish, or jellies as scientists call them, aren't fish. They have no brain, no heart, and no bones.
5. The Chinese giant salamander can grow to be 6 feet long, making it the largest salamander in the world.
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