46 items in this section. Displaying page 5 of 5
How do Flush Toilets Work?
Toilets are an amazing invention. Nearly every home has at least one. It is a very necessary utility needed in all homes to maintain hygiene. It is really amazing how this system works – you press a lever or pull a chain and whoosh! About two gallons of water rushes down into the porcelain bowl in three and four seconds. Gurgle-gurgle-urp it is clean and ready for use again! Toilets were known in India as early as three thousand years ago!...
How Does the Steam Engine Work?
In 1804 the first steam-powered engine ran, carrying some iron in Wales, in Britain. But it was almost twenty five years later, in 1829, that George Stephenson, a British engineer, designed the “rocket” that paved the way for railways all over Europe, Asia and America. How Does the Steam Engine Work? [Illustration by Shiju George] The steam engine is an example of a heat engine. Heat engines are those that convert heat energy into mechanical work....
How did the Safety Match Originate?
Fire was invented when two flint stones were struck together igniting a spark. From earliest times people made fire by either striking flint stones or by rubbing a hard stick against a soft one so that the friction caused soft flakes to peel off and start to smoulder. The only improvement on these primitive methods was the tinder box that contained some steel, flint, and some dry tinder for the spark to ignite. This tinder was often pieces of linen or silk....
The Hows and Whys of Bubble Gum
Chew this question: What is small and pink, tastes sweet, can be chewed for hours without it dissolving, yet is not to be swallowed? Some doctors feel that it helps to relieve stress. Others think it is good for the teeth. Americans are constantly rolling it about in their mouth and the US army gives it as part of field rations. No guesses for the correct answer. Yes, it is chewing gum or bubble gum as it is often called because you can blow large bubbles that go ‘pop’!...
How Do Fish Survive in Icy Waters?
In cold winter months, lakes and rivers freeze over forming ice. Yet, fish and other aquatic animals manage to survive. Animals like seals, penguins, walruses and a wide variety of sea birds are all fish eaters. They live in the Arctic and Antarctic Circle, amidst the icecaps. The land is completely frozen. Yet these animals manage to live in this region. How do they do it? The icy waters of the Arctic and Antarctic Oceans support a great amount of marine life....
How Does Dew Form?
Remember walking to the school or the bus stop on a cold wintry morning? You can see the beautiful crystal drops of dew, and if you happen to be on the grass, they could well be soaking your shoes. Ever wondered why there is no dew in the summer or rainy seasons? Well, special as it looks, dew needs special conditions to form as well. When a warm and clear day is followed by a cool evening and night, which is clear (cloudless), dew is formed....
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