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What is the lightest substance known?

March 11, 2017 | Author: | Posted in Science

The element hydrogen is the lightest substance known to science. Its specific gravity, compared to air, is 0.0695. Helium, with a specific gravity of 0.139, is the next lightest substance. Specific gravity is relative density, that is, the ratio of the weight of any volume of a substance to the weight of an equal volume …

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Does air have weight?

March 10, 2017 | Author: | Posted in Science

Air is a substance and all substances have weight. Air, however, is very light. A column of air an inch square extending from sea level upward as far as the atmosphere goes weighs only about fifteen pounds. This is called atmospheric pressure. Galileo first demonstrated that air has weight by weighing a glass globe, then …

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What determined the width of standard gauge railroads?

March 9, 2017 | Author: | Posted in Trains

The standard gauge railroad is four feet eight and one half inches wide, measured from the inside of one rail to the inside of the other. This width was determined largely by chance. When tramways were first built in the English coal districts their width was made to conform to the gauge of the common …

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How many square feet of skin does the body contain?

March 8, 2017 | Author: | Posted in Human Physiology

It is estimated that there are from fourteen to eighteen square feet of skin on the average adult human body. One investigator placed the figure as high as twenty square feet. Of course, the surface area of the body, which is practically equivalent to the number of square feet of skin, varies with sex, age, …

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Why does “T.L.” mean a compliment?

March 7, 2017 | Author: | Posted in General Knowledge

The letters T.L., when used to mean a compliment, are the abbreviation of trade last. These words acquired the meaning of an offer to give a compliment in exchange for one from the playful custom of a person saying to one of the opposite sex, “I have a trade last for you,” meaning that if …

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How did “dead as a doornail” originate?

March 6, 2017 | Author: | Posted in Language

Anything stone dead is said to be dead as a doornail. The conventional explanation of this phrase is that doornail was an old name for the plate or knob on which the knocker or hammer strikes. “As this nail is knocked on the head several times a day,” says an old writer, “it cannot be …

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What is ginseng used for?

March 5, 2017 | Author: | Posted in Alternative Medicine

Ginseng is not used in the United States to any considerable extent. A negligible quantity is used by Chinese in America and a trifling amount by makers of medicine and drugs, but the consumption of the root is confined almost entirely to China and virtually the entire American supply is exported to that country. Opinion …

Do snakes live in Ireland?

March 4, 2017 | Author: | Posted in Zoology

There are no native snakes in Ireland. The viviparous lizard is the only reptile found native on the Emerald Isle. Occasionally snakes are brought into Ireland or escape from packages of imported foodstuffs. A few years ago a small harmless snake less than two feet in length was found in Dublin. It attracted so much …

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How did “laconic” originate?

March 3, 2017 | Author: | Posted in Language

Laconic means “brief,” “concise,” “pithy.” It is an adjective formed from Laconia, the name of an ancient Greek country of which Lacedaemon or Sparta was the capital. The Laconians and Spartans were noted for their pointed, brusque and sententious speech. There is a tradition that Philip of Macedon once sent the following message to the …

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What distinguishes a blond from a brunet?

March 2, 2017 | Author: | Posted in Human Physiology

Blond and brunet are relative terms. It is impossible to draw a sharp distinction between them. Many persons have both blond and brunet characteristics. Generally in such a classification the complexion of the skin and the color of the hair and the eyes are taken into consideration. A blond is a person with light or …

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