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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
There are 20 feet of blood vessels in each square inch of human skin.
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.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.