Ask unlimited questions for free
Green tea is able to stop the scent of garlic or onion from causing bad breath.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
In 1864, the first barbiturate (barbituric acid) was synthesized.
The longest a person has survived after a heart transplant is 24 years.
Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
For a complete list of videos, visit our video library