Monthly Archives: December, 2009

How does a hydroelectric plant work?

Much of the electricity we use is produced by power plants located in huge dams.  Such plants, called hydroelectric plants, are run by the force of falling water. The water collects behind the dam.  It rushes down through an enclosed pipe and pushes against the blades are connected to a shaft which turns the generator. …

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What’s in a hotdog?

Hot dogs are a staple food in many Filipino households.  They’re part of our breakfast, merienda, and baon. Family outings, children’s parties, and barbecues are incomplete without them.  Yes, they’re very convenient: They’re early to prepare, relatively inexpensive, and don’t spoil easily—important in our hot and humid climate.  Some mothers also believe that hot dogs …

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Wishing you Christmas Happiness

  “ . . . and the glory of the Lord shone round about them.” May Christmas joys and happiness Fill your home with cheer, And Christmas peace be in your heart Through all the coming year.   Visual source:  peopix

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Why do plants have flowers?

Flowers are the reproductive parts of flowering plants.  They make seeds that become new plants. Do you hurry by flowers or do you step and wonder why these fragrant, brightly colored things grow on plants? Flowers are an important  part of a plant because they pass on life to future plant generations by making seeds. …

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How does a magnifying glass work?

A magnifying glass makes the print on this page look much bigger than it is. A magnifying glass is a glass lens that is thicker in the middle than it is on the edges.  It makes close objects look bigger because of the way in which it bends the rays of light that pass through …

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What are germs?

Men once believed that evil spirits made people sick.  Today we know that infectious diseases are caused by tiny organisms commonly called germs. Three common kinds of germs are bacteria, viruses, and protozoa Bacteria germs are one-celled plants that can be seen only through a microscope.  They cause many diseases, including pneumonia, scarlet fever and …

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What are clouds made of?

Pluffy dark clouds and fluffy white clouds—all clouds are made of the same thing.  They are made mostly of tiny droplets of water drifting about on currents of air.  Water to make clouds comes from oceans, lakes and streams. Everywhere water is continually evaporating into the air in the form of an invisible gas called …

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How is the height of a mountain measured?

When we read of high mountains in books, we may wonder how the height of a mountain is actually measured.  Most of our figures for mountain heights were obtained with an altimeter. This is a kind of barometer that uses air pressure to measure altitude, or height above sea level.  Altimeters give quick and easy …

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How is fiber glass made?

Fiber glass is made of very fine, flexible threads of glass, which can be spun and woven into cloth or used in many other ways. Fiber glass is made from sand and other materials used to make ordinary glass. The glass-maker first melts the glass materials and forms them into small glass marbles.  He then …

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How are stained-glass windows made?

In a church you may see a windows that look like a big jigsaw puzzles made of many pieces of colored glass held together with strips of lead.  The windows are called stained glass windows. To make such a window, the artist makes a big drawing on paper of the picture that he wants to …

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