That's the weight of about six elephants. Some ribbon worms will eat themselves if they can't find any food.
Dolphins sleep with one eye open.
The world's oldest piece of chewing gum is over 9,000 years old. In space, astronauts cannot cry because there is no gravity, the tears can't flow. There are more plastic flamingos in the U.S. than real ones. About 3,000 years ago, most Egyptians died by the time they were 30. More people use blue toothbrushes than red ones.