Ask unlimited questions for free
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The longest a person has survived after a heart transplant is 24 years.
Cyanide works by making the human body unable to use oxygen.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
For a complete list of videos, visit our video library