Ask unlimited questions for free
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
There are approximately 3 million unintended pregnancies in the United States each year.
In 1864, the first barbiturate (barbituric acid) was synthesized.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Asthma cases in Americans are about 75% higher today than they were in 1980.
For a complete list of videos, visit our video library