Ask unlimited questions for free
If you could remove all of your skin, it would weigh up to 5 pounds.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
For a complete list of videos, visit our video library