Ask unlimited questions for free
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Illicit drug use costs the United States approximately $181 billion every year.
There are more bacteria in your mouth than there are people in the world.
For a complete list of videos, visit our video library