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Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The human body produces and destroys 15 million blood cells every second.

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The longest a person has survived after a heart transplant is 24 years.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Pre–steady state kinetic evidence for an acyl-enzyme intermediate Pre–steady state kinetic evidence for an acyl-enzyme intermediate
Cause of Inflation Cause of Inflation
Urban Growth and Urban Flight Urban Growth and Urban Flight
Growth of a Renewable Resource Growth of a Renewable Resource
Growth of Government Spending, 1870–2009 Growth of Government Spending, 1870–2009
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Video: Immune responses Animation

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