| Trivia by ArcaMax, sponsored today by: | | | | According to experts, large caves tend to "breathe"; they inhale and exhale great quantities of air when the barometric pressure on the surface changes, and air rushes in or out seeking equilibrium.
| | Sponsor (November 9, 2012) - Do Not Pay Your Car Insurance Bill... Until You Read This. Out of all 246 auto insurers, we found these important "hidden" discounts. * After reporting on the hidden discounts, 650,000 drivers used this one tip to get extreme insurance discounts. * Recently reported: if you're just with "any" auto insurer, you may be overpaying by $793 a year. Click here -- to see the insurance discounts you'll get. | | Most insect repellents used by humans work on the principle of either masking odors that might attract insects or by creating smells that are repulsive to them.
| | The deepest mine in the world, at least as of 2003, was the East Rand mine in South Africa, which goes down 11,761 feet, just a hair more than the Western Deep mine, also in South Africa, at 11,747 feet.
| | Mining that deep in the Earth is full of hazards, principally the weight of rock above you. At two miles underground, the pressure is 9500 tons per square meter, which is approximately 900 times normal atmospheric pressure. As more rock is removed in the mining process, this can increase three fold.
| | Quite the opposite, actually. The deeper the shaft, the greater the heat, reaching as high as 158 degrees at around four miles down. While cooling equipment allows men to work, when the rock's temperature is lowered by the equipment, and by removal of the rock face, it causes a phenomenon known as "rock burst", which is responsible for the deaths of many miners.
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