Ask unlimited questions for free
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The human body produces and destroys 15 million blood cells every second.
For a complete list of videos, visit our video library