Ask unlimited questions for free
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
The human body produces and destroys 15 million blood cells every second.
There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
For a complete list of videos, visit our video library