Ask unlimited questions for free
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The horizontal fraction bar was introduced by the Arabs.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Blood is approximately twice as thick as water because of the cells and other components found in it.
For a complete list of videos, visit our video library