What Is Humidity?
Humidity is the amount of moisture, or water vapor (water in the form of a gas) in the air around us. There is always some water vapor in the air. It evaporates from...
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Do Insects Have Ears?
Yes. Many insects have ears, although they do not look much like ours. They hear with help from some very unusual ears. The ears of many insects are not on their heads....
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Where Does the Wax Go When a Candle Burns?
Where Does the Wax Go When a Candle Burns? The wax that doesn’t drip down the side of a burning candle turns into a gas that produces the bright flame. When the...
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What Do You Mean by the Term Have Your Heart in Your Mouth?
What Do You Mean by the Term Have Your Heart in Your Mouth? This expression means that you are really scared or anxious about something. The ancient Greek poet Homer...
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How Does Electricity Travel Through a Wire?
How Does Electricity Travel Through a Wire? Electricity comes into our buildings on copper or aluminum wires from giant electric generators in power stations. The...
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What Do You Mean by the Term by the Skin of Your Teeth?
What Do You Mean by the Term by the Skin of Your Teeth? If you pass a test by just a few points or win a contest by a tiny bit, people might say you did so “by...
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What Do You Mean by the Term Tongue in Cheek?
What Do You Mean by the Term Tongue in Cheek? This funny sounding expression indicates that someone just told a joke or isn’t being serious! If someone says...
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How Does a Magnet Get Its Magnetism?
How Does a Magnet Get Its Magnetism? All things, including magnets, are made of tiny atoms. Atoms are made of even tinier particles, among them things called electrons....
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How Did the Praying Mantis Get Its Name?
How Did the Praying Mantis Get Its Name? The praying mantis got its name from its appearance. It is a long, slender insect that often sits in an upright position with...
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When Were Books First Made?
When Were Books First Made? Books have a long history. When ancient civilizations first started developing writing systems, they would write on just about anything,...
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