Why does skin wrinkle when it is exposed at length to water?
The skin on the foot or palm of the hand wrinkles when exposed to water because it expands.
The thick, hardened layers of skin swell as water is retained.
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Why do we get goose bumps when it’s cold?
Goose bumps are a vestige from the days when humans were covered with hair. When it got cold, the hairs stood on end, creating a trap for air and providing insulation. The hairs have long since disappeared, but in the places where they used to be, the skin still bristles, trying to get warm.
What makes houseplants turn toward the light?
Growth hormones called auxins makes houseplants turn toward the light. When light falls on one side of a plant, the auxins tend to concentrate on the shaded side, causing the cells on that side to grow longer. As a result, the plant gradually leans toward the light. This bending movement in response to an outside…
How long are the intestines?
The small intestine, which is contained in the central and lower abdominal cavity, is 20 to 23 feet long. The large intestine is 5 feet long.
How does the marriage rate in the United States in recent years compare to that in 1900?
Recent marriage rates have been fairly similar to what they were at the turn of the century. In 1900, the marriage rate was 9.3 per 1,000; in 1988, it was 9.7. The divorce rate, however, has changed drastically. In 1900, it was 0.7 per 1,000; in 1988, it was 4.8.
How many sperm cells are contained in an average human ejaculation?
There are about 200 million to 300 million sperm cells are contained in an average human ejaculation. Yet sperm cells make up only 2 to 5 percent of total sperm volume. The rest is composed of fluids, known as seminal plasma, that help keep the sperm cells alive.
Who developed the lobotomy?
The prefrontal lobotomy was invented by Portuguese surgeon Antonio Caetano de Abreu Freire Egas Moniz (1874-1955) for patients with incurable mental disturbances. Moniz, who also served as the foreign minister of Portugal from 1918 to 1919, was awarded the Nobel Prize in physiology or medicine in 1949.