How Are Diamonds Formed?
You may know that diamonds are crystals formed almost entirely of carbon. Natural diamonds are formed in dying volcanoes, where great heat and pressure act on the...
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Why Must a Fever Thermometer Be Shaken Each Time It Is Used?
Why Must a Fever Thermometer Be Shaken Each Time It Is Used? A fever thermometer is a special kind of thermometer. It shows whether or not you have a fever when you are...
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Why Do Drops of Moisture Form on a Cold Glass?
Why Do Drops of Moisture Form on a Cold Glass? The beads of moisture that form on a glass of ice-cold water on a warm day have nothing to do with the liquid inside the...
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When Were Mirrors First Used?
We will never know who first discovered the idea of a mirror. But our earliest ancestors must have noticed that they could see their reflections in the surface of a...
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How Is Glass Made?
Ordinary glass is made from clean, white sand and two white, powdery chemicals known as soda and lime. Just plain sand can be made into glass, but it must be heated to...
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