Why Do Water Pipes Sometimes Burst in Winter?
Why Do Water Pipes Sometimes Burst in Winter? Cold water pipes may burst in winter when the outside temperature falls below 0°C (32 °F) and the water turns to ice. The...
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Why Is Fluoride Put in Drinking Water?
Drinking water containing fluoride, or, to be more exact, sodium fluoride, is generally believed to help in preventing dental trouble. It was not until the late...
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Why Does Frozen Food Keep Well?
Why Does Frozen Food Keep Well? Frozen food keeps for a long time because the freezing of the water inside the food forces the bacteria, which cause it to decompose,...
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Where Were Kites First Flown?
Where Were Kites First Flown? Kites have been used in Asia since time immemorial. Some evidence dates their invention at around 1,000 B.C. Kite flying has been a...
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When Was Concrete Invented?
When Was Concrete Invented? The earliest known occurrence of cement was twelve million years ago. A deposit of cement was formed after an occurrence of oil shale...
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What Is the Importance of a Cloud Forest?
What Is the Importance of a Cloud Forest? An important feature of cloud forests is the tree crowns can intercept the wind-driven cloud moisture, part of which drips to...
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What Is a Theodolite?
What Is a Theodolite? A theodolite is a surveying instrument used for measuring horizontal and vertical angles, and has been adapted for specialized purposes such as...
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How Is Soap Manufactured?
How Is Soap Manufactured? Soap is made largely from fats or oil, with a variety of other ingredients. Before the introduction of soap in the 1st Century A.D. people...
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What Is the Difference Between a Shaving and Toilet Soap?
What Is the Difference Between a Shaving and Toilet Soap? Shaving soap is produced like a traditional soap with an ingredient selection oriented to producing a stable,...
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What Is Kleine-Levin Syndrome?
What Is Kleine-Levin Syndrome? KLS is a disease of adolescence, and sometimes will begin after infection or illness, says Tom Rico of the Center for Narcolepsy &...
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