1. Sound travels over 14 times faster through steel than through air. If you need to signal someone quickly standing on a metal bridge, bang on a steel pipe
2. The Great Pyramid of Cheops in Egypt, built about 2600 BC, was constructed with enough stone to make a brick wall that could go around the world 20 inches high.
3. When high speed trains past each other they must slow down or they will break their windows. The passing trains produce a low-pressure area between them that can actually pull the glass out of the frames
4. Donald Duck, the cartoon character NEVER wore pants. But, whenever he got out of a shower he would always put a towel around his waist.
5. A normal piece of paper cannot be folded more than 7 times.
6. The average person will spend 4 years of their life on the toilet!
7. Thomas Edison, the inventor of the lightbulb, was actually afraid of the dark.
8. Fish swimming at depths of 15,000 feet (almost 3 miles down!) can withstand a pressure of 7,000 pounds per square inch. They are able to live in these crushing depths by pumping gas into their swim bladder.
9. Whether an alligator is a male or female can be determined by the temperature of the nest where the egg is hatched â€“ 90 to 93 degrees will make it a male; 82 to 86 degrees will turn it into a female.
10. Water is the only substance on earth that is lighter as a solid than a liquid.