Ask unlimited questions for free
There are more bacteria in your mouth than there are people in the world.
Medication errors are more common among seriously ill patients than with those with minor conditions.
The longest a person has survived after a heart transplant is 24 years.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Vaccines prevent between 2.5 and 4 million deaths every year.
For a complete list of videos, visit our video library