When Was the First Lighthouse Built?
When Was the First Lighthouse Built? The first known lighthouse was the Pharos of Alexandria in Egypt, a 400-foot tower built about 280 B.C. A wood fire was kept...
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Why Do Myotonic Goats Faint?
Why Do Myotonic Goats Faint? Not all goats faint. Those that do exhibit fainting behavior are members of a special breed that goes by a variety of names. Most often...
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Why Do Some Acids Cause Burns?
Why Do Some Acids Cause Burns? Some acids burn because they have a strong tendency to absorb water, giving out a great deal of heat in the process. Since most living...
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Why Do Soldiers Salute?
Why Do Soldiers Salute? The custom of saluting has always existed in all cultures. A salute is a gesture or other action used to display respect. Salutes are primarily...
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Who Invented the Rocket?
Who Invented the Rocket? The rocket, as far as can be established, was invented by the Chinese during the 12th or 13th Century. The Chinese used their rockets as...
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What Is Krishna Janmashtmi?
What Is Krishna Janmashtmi? Krishna was the son of Devaki and Vasudeva and his birthday is celebrated by Hindus as Janmashtami, particularly those of the Vaishnavism...
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When Does Copper Turn Green?
When Does Copper Turn Green? Although copper is highly resistant to the chemical action of the atmosphere and of sea water, it turns green if exposed to them for a long...
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Why Does Iron Go Red When Heated?
Why Does Iron Go Red When Heated? Iron goes red when heated because its atoms radiate vibratory waves of an electromagnetic nature that are visible as light at a...
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When Were Fireworks Introduced?
When Were Fireworks Introduced? The use of fireworks, or pyrotechnics, probably began when some prehistoric man mixed saltpetere (potassium nitrate) from his cooking...
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What Is Glass Made From?
What Is Glass Made From? Glass is made naturally from a fusion of silica (sand), soda and lime. This fusion can be achieved merely by lightning striking in a place...
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