Ask unlimited questions for free
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
The horizontal fraction bar was introduced by the Arabs.
Your heart beats over 36 million times a year.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
For a complete list of videos, visit our video library