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The familiar sounds of your heart are made by the heart's valves as they open and close.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

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The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution
The Nucleus The Nucleus
Release of Dopamine in the Nucleus Accumbens Release of Dopamine in the Nucleus Accumbens
What is the identity of this atom? What is the identity of this atom?
Which of the following is the electron dot formula for an atom of strontium? Which of the following is the electron dot formula for an atom of strontium?
Opener Chromosome territories in a chicken cell nucleus Opener Chromosome territories in a chicken cell nucleus
Video: What is an ecosystem?

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