Why Does a Compass Needle Point North to South?
When the magnetic needle of a compass is allowed to move freely it will automatically place itself in line with the earth’s magnetic field, one end pointing to the...
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When Was the Ocean Floor First Mapped Accurately?
The earliest methods of depth measurement on record are the use of sounding poles and weighted lines, recorded from Egypt more than 3000 years ago, and in use without...
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Why Were Early Maps Decorated?
Many early maps were decorated because the map-makers or cartographers had little real idea of geography and presented the world in symbolical terms. One map of Roman...
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When Were Jigsaw Puzzles Invented?
When Were Jigsaw Puzzles Invented? The jigsaw puzzles are a delightful and perplexing challenge wherein a picture made of cardboard or wood has been cut into...
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