Ask unlimited questions for free
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
There are 20 feet of blood vessels in each square inch of human skin.
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