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Did you know?
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Did you know?
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
The human body produces and destroys 15 million blood cells every second.