Ask unlimited questions for free
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
For a complete list of videos, visit our video library