If no one else relies on your income, life insurance may not be necessary.
Ask unlimited questions for free
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
For a complete list of videos, visit our video library