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359. Where on Earth are the most of telescopes mounted?

It is on the Kitt Peak, a 2096 meter high mountain in Arizona, USA. Due to excellent watching conditions and atmospheric clarity here, at the Kitt Peak National Observatory, 23 major telescopes are there on its summit, since 1958!
 
248. Why is 1921 an important year for mountain climbers?

Because it was in that year that Dalai Lama gave permission for Everest to be climbed for the first time. This first expedition was mainly to discover if a route to summit could be found from the Tibetan side. However, though many dreamed of standing on the rooftop of the world, they were all doomed to failure. In 1922, seven sherpas died in an attempt by the British expedition led by George Mallory to reach the summit. In 1924, a third expedition managed to reach 8572 meter, but two members of the team, Mallory and Irvine, disappeared into the mist and were never seen again! Mount Everest continued to lure climbers after climbers, but it was only in 1953 that it was finally conquered.
 
247. Why do people have different skin colors?

Skin color is due primarily to the presence of a pigment called melanin , which is controlled by at least 6 genes. Both light and dark complexioned people have melanin. However, two forms are produced--pheomelanin , which is red to yellow in color, and eumelanin , which is dark brown to black.
 
246. Why does tea leave brown stains on the cup, whereas coffee does not?

The reason is that tea contains tannin (or tannic acid) which gives tea its colour. Tannin is used as an agent for many dyes such as in the tanning of leather and in making ink, hence the reason that a stain is left in cups. One wonders what it does to our insides. Coffee does not contain tannin.
 
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