SCIENCEROCS

Here are a few: -Human tapeworms can grow up to 22.9m. -When a flea jumps, the rate of acceleration is 20 times that of the space shuttle during launch. -Giraffes often sleep for only 20 minutes in any 24 hours. They may sleep up to 2 hours (in spurts – not all at once), but this is rare. They never lie down. -There are 60,000 miles of blood vessels in the human body.