1 Aug 2010 Sun |
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| இல்லறவியல் - விருந்தோம்பல் |
| விருந்து புறத்ததாத் தானுண்டல் சாவா மருந்தெனினும் வேண்டற்பாற் றன்று [ திருக்குறள்:1.2.5] |
| Domestic Virtue - Hospitality |
| To keep out guests cannot be good Albeit you eat nector-like food [ Thirukural:1.2.5] |
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| Did You Know? |
| How far does regular dust blow in the wind? [Earth Facts] |
| A 1999 study showed that African dust finds its way to Florida and can help push parts of the state over the prescribed air quality limit for particulate matter set by the U.S. Environmental Protection Agency. The dust is kicked up by high winds in North Africa and carried as high as 20,000 feet (6,100 meters), where its caught up in the trade winds and carried across the sea. Dust from China makes its way to North America, too. |
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| Can rocks grow? [Earth Facts] |
| Yes, but observing the process is less interesting than watching paint dry. Rocks called iron-manganese crusts grow on mountains under the sea. The crusts precipitate material slowly from seawater, growing about 1 millimeter every million years. Your fingernails grow about the same amount every two weeks. |
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| What makes thunder? [Earth Facts] |
| If you thought, "Lightning!" then hats off to you. But I had a more illuminating answer in mind. The air around a lightning bolt is superheated to about five times the temperature of the Sun. This sudden heating causes the air to expand faster than the speed of sound, which compresses the air and forms a shock wave; we hear it as thunder. |
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| What is the coldest place on Earth? [Earth Facts] |
| Far and away, the coldest temperature ever measured on Earth was -129 Fahrenheit (-89 Celsius) at Vostok, Antarctica, on July 21, 1983. |
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