Question 1
Question 2
Ask unlimited questions for free
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
For a complete list of videos, visit our video library