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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern
Angry jeers from whites rain down on Elizabeth Eckford, one of the first African American students ... Angry jeers from whites rain down on Elizabeth Eckford, one of the first African American students ...
El Lissitzky, Beat the Whites with the Red Wedge. El Lissitzky, Beat the Whites with the Red Wedge.
How to calculate present value using the compound interest formula (Question 1) How to calculate present value using the compound interest formula (Question 1)
Single-serve cups of infant formula Single-serve cups of infant formula
Quadratic Formula Quadratic Formula
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

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