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Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Cellular section from the brain of a person who died from Alzheimer's disease. Cellular section from the brain of a person who died from Alzheimer's disease.
Devil facial tumour disease causes tumours to form in and around the mouth, interfering with feeding Devil facial tumour disease causes tumours to form in and around the mouth, interfering with feeding
Renal regulation of sodium and potassium balance Renal regulation of sodium and potassium balance
Age at First Sign of Psychotic Symptoms in Schizophrenic Patients Age at First Sign of Psychotic Symptoms in Schizophrenic Patients
(A) Female head louse. (Courtesy of the Centers for Disease Control and Prevention/ Dr. Dennis ... (A) Female head louse. (Courtesy of the Centers for Disease Control and Prevention/ Dr. Dennis ...
Crown gall disease caused by Agrobacterium via plant transformation Crown gall disease caused by Agrobacterium via plant transformation
Video: Role of the urinary system - acidosis and alkalosis

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