Some bacteria have a built-in motor that spins their tail like a propeller — it’s like nature’s version of a little wheel!
Inventions And Technology - Facts for Kids

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Random Facts About Inventions And Technology For Kids
Television signals travel at the speed of light, approximately 186,000 miles per second (299,792 kilometers per second), which is why live broadcasts from around the world appear instantly on your screen!
The GPS system’s full operational capability (with 24 active satellites in their assigned orbits) was declared on April 27, 1995 — after more than 20 years of development.
Hamsters can run at speeds of up to 8 miles per hour on their wheels, and some may run between 5 and 6 miles every night.
Some people have used iPads to create full-length movies, books, and music albums – all from a device that fits in a backpack!