Ask unlimited questions for free
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
Excessive alcohol use costs the country approximately $235 billion every year.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
For a complete list of videos, visit our video library