Physics
1. The first electronic digital computer (called ENIAC - the Electronic Numerical Integrator and Calculator) was developed in 1946 and contained over 18,000 vacuum tubes. | 2. The leg muscles of a locust are about 1000 times more powerful than an equal weight of human muscle. | 3. The cosmos contains approximately 50,000,000,000 galaxies. | 4. There are between 100,000,000,000 and 1,000,000,000,000 stars in a normal galaxy. | 5. Sound travels about 4 times faster in water than in air. | 6. Scientists have discovered that copper pollution of the atmosphere occurred about 2500 years ago. This was discovered by analyzing ice cores from Greenland. The pollution was attributed to the Romans who used copper for military purposes and to produce coins. | 7. Hydrofluoric acid will dissolve glass. | 8. In a full grown rye plant, the total length of roots may reach 380 miles (613 km). | 9. In a full grown rye plant, the total length of fine root hairs may reach 6600 miles (10,645 km). | 10. A large sunspot can last for about a week. | 11. If you could throw a snowball fast enough, it would totally vaporize when it hit a brick wall. | 12. Boron nitride (BN) is the second hardest substance known to man. | 13. The female Tarantula Hawk wasp paralyzes a large spider with her sting. She then lays her eggs on the motionless body so that her developing young have a fresh supply of spider meat to feed on. | 14. The seeds of an Indian Lotus tree remain viable for 300 to 400 years. | 15. The only letter not appearing on the Periodic Table is the letter “J”. | 16. Velcro was invented by a Swiss guy who was inspired by the way burrs attached to clothing. | 17. Hershey's Kisses are called that because the machine that makes them looks like it's kissing the conveyor belt. | 18. October 10 is National Metric Day. | 19. If you stretch a standard Slinky out flat it measures 87 feet long. | 20. The