How much of your body’s heat do you lose by not covering your head in the cold?
Your mother was right.
You lose about half to three-fourths of heat from your head.
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What are polymers and are they the same thing as plastics?
Plastics are only one kind of polymer, a substance composed of very large chain-like molecules that consist of smaller, repeating chemical units. Natural polymers include proteins, cellulose, diamonds, and quartz. Besides plastics, man-made ones include concrete, glass, and paper.
Who came up with the phrase survival of the fittest?
Charles Darwin did not come up with the phrase survival of the fittest. The British philosopher and scientist Herbert Spencer introduced the phrase in Principles of Biology (1864-1867) as a way of describing Darwin’s theory of natural selection.
What is the apple of one’s eye?
The apple of one’s eye is the pupil, which was likened to an apple because, in the ninth century, it was believed to be a solid round mass.
What is the continental shelf?
The continental shelf is an underwater ledge around the coastline of the world’s oceans. The edge of the shelf lies at depths of between 360 and 480 feet. The width may vary from a few feet to several hundred miles.
How many muscles does it take to smile and to frown?
Smiling is easier on the face than frowning. It takes 17 muscles to smile and 43 to frown.
Who named the quark?
American physicist Murray Gell-Mann (b. 1929) named the quark in 1964. He took the name from James Joyce’s Finnegans Wake. A quark, a subatomic particle with a fractional electric charge, is believed by physicists to be the fundamental unit of matter.