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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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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo
The “Big Four” world leaders meet at the Hotel Crillon in Paris, 1919. From left to right (front row The “Big Four” world leaders meet at the Hotel Crillon in Paris, 1919. From left to right (front row
Dolores Huerta and Cesar Chavez, leaders of the United Farm Workers, discuss their 1968 strike of ... Dolores Huerta and Cesar Chavez, leaders of the United Farm Workers, discuss their 1968 strike of ...
Each year, the leaders of the world’s eight most powerful nations meet in a secluded place to make ... Each year, the leaders of the world’s eight most powerful nations meet in a secluded place to make ...
Processes of Lightning Formation: Leaders, Strokes, and Flashes Processes of Lightning Formation: Leaders, Strokes, and Flashes
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Video: Protein Structure - Primary, Secondary, Tertiary and Quaternary

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