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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Cyanide works by making the human body unable to use oxygen.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

By middle adulthood, most individuals and established and confident in their careers By middle adulthood, most individuals and established and confident in their careers
In 2006 an Iraqi tribunal convicted Saddam Hussein of murdering his own people and sentenced him to In 2006 an Iraqi tribunal convicted Saddam Hussein of murdering his own people and sentenced him to
For millions of people, the United States represents a land of opportunity and freedom from ... For millions of people, the United States represents a land of opportunity and freedom from ...
Pathophysiology of celiac disease. In susceptible individuals, gluten-containing foods are digested, ... Pathophysiology of celiac disease. In susceptible individuals, gluten-containing foods are digested, ...
People with night eating syndrome may consume more than half their day's calories between 8 pm ... People with night eating syndrome may consume more than half their day's calories between 8 pm ...
Sources of Variation in Traits Among Individuals of a Species Sources of Variation in Traits Among Individuals of a Species
Video: Sister chromatids of a metaphase chromosome animation

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