What Is a Hoverboard?
A hoverboard (or hover board) is a fictional levitating board used for personal transportation, first described by author M. K. Joseph in 1967 and popularized by the...
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How Do Flying Fish Fly?
How Do Flying Fish Fly? Flying fish live in the warm oceans. This unusual fish is able to glide for long distances over the surface of the water by means of two...
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How Does a Rocket Engine Work?
How Does a Rocket Engine Work? You can make a simple rocket by filling a toy balloon with air and letting it go. Rockets work on the Newton’s principle that every...
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What Is a Light-year?
What Is a Light-year? Space is so vast that scientists don’t use miles to measure how far stars are away from us. The number of miles would be too large to work...
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What Do the Letters Z-I-P Stand for in the Words Zip Code?
What Do the Letters Z-I-P Stand for in the Words Zip Code? The “ZIP” in “ZIP code” seems to describe the speed with which mail is delivered...
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