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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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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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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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.

Competition can be (a) direct, or (b) indirect interaction among individuals of the same or differen Competition can be (a) direct, or (b) indirect interaction among individuals of the same or differen
Creede, Colorado, circa 1890, a rough silver mining town that grew from 660 people in 1889 to over 1 Creede, Colorado, circa 1890, a rough silver mining town that grew from 660 people in 1889 to over 1
A propaganda poster enshrining Stalin proclaims that he has led his people “Forward to ... A propaganda poster enshrining Stalin proclaims that he has led his people “Forward to ...
Many people consider the British statesman Winston Churchill (1874–1965) to be an exemplar of the ... Many people consider the British statesman Winston Churchill (1874–1965) to be an exemplar of the ...
Aggregates are people who happen to be in the same place at the same time. Aggregates are people who happen to be in the same place at the same time.
How People Match Their Goals to Their Means How People Match Their Goals to Their Means
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