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Posted: Mon Apr 26, 2010 9:01 pm
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Posted: Mon Apr 26, 2010 9:02 pm
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Posted: Mon Apr 26, 2010 9:03 pm
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Posted: Mon Apr 26, 2010 9:05 pm
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A downburst is a downward blowing wind that sometimes comes blasting out of a thunderstorm. The damage looks like tornado damage, since the wind can be as strong as an F2 tornado, but debris is blown straight away from a point on the ground. It's not lofted into the air and transported downwind.
On December 2, 1942, a nuclear chain reaction was achieved for the first time under the stands of the University of Chicago’s football stadium. The first reactor measured 30 feet wide, 32 feet long, and 21.5 feet high. It weighed 1,400 tons and contained 52 tons of uranium in the form of uranium metal and uranium oxide. Although the same process led to the massive energy release of the atomic bomb, the first artificially sustained nuclear reaction produced just enough energy to light a small flashlight.
A raisin dropped in a glass of fresh champagne will bounce up and down continually from the bottom of the glass to the top. This is because the carbonation in the drink gets pockets of air stuck in the wrinkles of the raisin, which is light enough to be raised by this air. When it reaches the surface of the champagne, the bubbles pop, and the raisin sinks back to the bottom, starting the cycle over.
Bacteria, the tiniest free-living cells, are so small that a single drop of liquid contains as many as 50 million of them.
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Posted: Mon Apr 26, 2010 9:10 pm
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Posted: Mon Apr 26, 2010 10:06 pm
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Posted: Tue Apr 27, 2010 12:13 am
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Posted: Tue Apr 27, 2010 7:10 pm
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Posted: Tue Apr 27, 2010 7:14 pm
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Posted: Tue Apr 27, 2010 7:19 pm
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Posted: Tue Apr 27, 2010 7:21 pm
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Posted: Tue Apr 27, 2010 7:26 pm
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Posted: Tue Apr 27, 2010 7:28 pm
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Posted: Tue Apr 27, 2010 7:33 pm
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Posted: Tue Apr 27, 2010 7:39 pm
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