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Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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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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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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There are approximately 3 million unintended pregnancies in the United States each year.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

The sea urchin Diadema on a coral reef. Feeding by Diadema appears to play a key role in the interac The sea urchin Diadema on a coral reef. Feeding by Diadema appears to play a key role in the interac
The Sun as it appears from the surface of Earth before sunset. The Sun as it appears from the surface of Earth before sunset.
Photograph of the retina of the eye. The optic disk appears yellow and the retinal arteries radiate Photograph of the retina of the eye. The optic disk appears yellow and the retinal arteries radiate
Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu
The Sun as it appears from the surface of the Earth at sunrise. The Sun as it appears from the surface of the Earth at sunrise.
The tetravalent synaptic structure and alternate and adjacent chromosome The tetravalent synaptic structure and alternate and adjacent chromosome
Video: Michaelis–Menten equation & Kinetic parameters

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