1- In space astronauts cannot cry, because there is no gravity, so the tears can't flow.
2- About 3000 years ago most of the Egyptians died by the time they were 30.
3- During the life time, a person eats about 60,000 pounds of food that's the weight of about 6 elephants.
4- some ribbon worms eat themselves If they can't find any food.
5- Dolphins sleep with one eye open.
6- The world's oldest piece of chewing gum is 9000 years old.
7- There is about 90% of water in the watermelon. 