Space: 22 5 million--the number of years it takes for the Milky Way to rotate once.
Nature: The most expensive substance in the world: Red diamond. $5,000,000 per gram. So rare that only 30 are presumed to exist in the world.
Dinosaur Times: Before the dinosaurs, 245 million years-old fossils were found in Germany of Eryops, a carnivore that lived in both water and land. It was 6.6 feet long and was a fierce predator with sharp teeth that made it impossible to chew so it trapped fish in its jaws, then threw back its head to swallow them, much like alligator and crocodiles and alligators do today.
Animals: An endurance athlete, the ostrich, with a speed of 30mph, could run a marathon in 52 minutes.
The Body: At 5 weeks, a human embryo is the size of a sesame seed. At 10 weeks, it's the size of a green olive.
Being Human: There are 3 times more chickens than human beings in the world.
Inventions: The Slinky was invented by accident by Richard James, an American naval engineer who was developing a spring to keep equipment stable on ships. One day he accidentally knocked some springs off a shelf and noticed that they continued to tumble end over end across the floor. This gave him the idea for the Slinky.
Game Changers: In 1943, at age 12, Vicki Van Meter from Pennsylvania flew an airplane across the Atlantic Ocean.
