If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The human body produces and destroys 15 million blood cells every second.
The elephant raises its trunk as a sign of warning or to smell enemies or friends
Linked alleles tend to be inherited together
The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest
How lateral inhibition produces contrast enhancement. (Based on Ratliff, 1972.)