Ask unlimited questions for free
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
The longest a person has survived after a heart transplant is 24 years.
There are more nerve cells in one human brain than there are stars in the Milky Way.
For a complete list of videos, visit our video library