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Science Fiction
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"It's also important to vary your stimuli. I always look for new things to shock the system. Just as you make muscles grow by shocking them, you make the mind grow by shocking it."
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Early navigation relied on several natural phenomena; the fixed pole star (or stars, when the pyramids were built) and the north magnetic pole. What can you do if a planet has no stable magnetic field, or if the planet's surface is prone to storms that disrupt the field?
People have made practical use of the Earth's magnetic field since ancient times, but it wasn't until 1600 that William Gilberte, personal physician to Queen Elizabeth, published his astounding De Magnete. In it, he revealed his studies with a "terrella" (a magnetized sphere); he hypothesized that the Earth was itself an immense magnet.
If you're into magnetic fields (and, in fact, we all are - just use a compass!), take a look at the very cool Earth's Magnetic Field Images, an interactive page that allows you to see field strengths at different years in the 20th century. (Courtesy of our friends at NOAA - the National Oceanic and Atmospheric Administration.) (Special thanks to a reader who pointed me to a new URL for the old one!) Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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Science Fiction
Timeline
'If Anyone Is Watching Earth...'
'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'
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'...the spreading beam of the deranging ray struck them, and Then one toppled and fell. Then another.'
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'The men are dead, but their acquired wisdom lives on and I am the beneficiary.'
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'Young people found the driverless car admirable for petting.'
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'After twenty generations of shillyshallying...'
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