Ask unlimited questions for free
The horizontal fraction bar was introduced by the Arabs.
There are more bacteria in your mouth than there are people in the world.
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
For a complete list of videos, visit our video library