Why Do We Use Double Glazing?
Why Do We Use Double Glazing? Double glazing for windows reduces loss of heat through the glass and cuts down noise from outside. There are many different systems,...
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When Is the Earth Nearest the Sun?
When Is the Earth Nearest the Sun? The Earth is nearest to the Sun on about the second or third day in January. The distance varies because the Earth spins round the...
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Who Built Zeppelins?
Who Built Zeppelins? Zeppelins were airships-or dirigible balloons of rigid type-built by Count Ferdinand von Zeppelin (1838-1917), a German army officer. He became...
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When Was the Gyroscope Invented?
When Was the Gyroscope Invented? Any spinning object resists attempts to change the direction of its axis, the imaginary straight line round which it revolves. Thus you...
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Why Can’t You Look Directly at the Sun During a Solar Eclipse?
Why Can’t You Look Directly at the Sun During a Solar Eclipse? It’s never a good idea to stare directly at the sun. If you’ve ever looked directly at...
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How Does Sewage Plant Work?
How Does Sewage Plant Work? A sewage plant works by purifying waste material and recycling it for a useful purpose. Waste material from lavatories, sinks, baths and...
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Who Was Thomas Newcomen?
Thomas Newcomen (1664-1729) was the English inventor of the only practical steam engine in use from the early to late 18th century. He was the predecessor of the much...
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What Is a Mirage?
What Is a Mirage? Mirages are optical illusions produced by extraordinary atmospheric conditions. They can be non-existent sheets of water or similar visions, inverted...
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How Does a Tuning-fork Work?
How Does a Tuning-fork Work? A tuning-fork vibrates to give a musical note of definite pitch or frequency and is marked on the fork by a letter or symbol referring to...
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What Is Tarmac?
What Is Tarmac? Tarmac is a hard black material used for roads, parade grounds or anywhere that a hard, even and durable surface is needed. It is a mixture of tar...
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