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465. What is the Largest mobile Network in the world?

With subscriber strength of 851.2 million, China Mobile is undoubtedly the champion mobile network operator in the world. China Mobile was conceived in 1999 as a result of the China Telecom break which was originally founded on September 3rd, 1997. The headquarters of China Mobile are located in Beijing, People's Republic of China, and it has since dominated the mobile service industry in China. China Mobile is under the direct control of the People's Republic of China as it is an enterprise owned by the state. China Mobile has a market share of 70% and continues to control the vast majority of its mobile services market with the remaining 30% being shared between China Unicom with 20% shares and China Telecom with 10% shares in the mobile service market.
 
464. Which planet has the strongest winds?

Neptune has the strongest winds in the Solar System. Winds whip clouds of frozen methane across the planet at speeds of more than 1,200 miles per hour (2,000 kilometers per hour). This is close to the top speed of a U.S. Navy F/A-18 Hornet fighter jet!
 
463. Why is the moon invisible at times?

We cannot see the moon, which reflects the light from the sun, when sunlight falling on it is not visible from the Earth, or when something comes in the way of the reflected light. The first phenomenon occurs every four weeks at new moon. At this time, the moon is positioned between the Earth and the sun. It reflects the light, but from the 'invisible side' so that we cannot see its illuminated surface. The second phenomenon occurs during a lunar eclipse. In this case, the Earth is positioned on a straight line between the sun and the moon, and consequently the sunlight does not fall on the moon.
 
462. How do bats orient themselves with ultrasounds?

Bats cannot see very well. To orient themselves during their night flights, they emit ultrasounds. We cannot hear these sounds. The ultrasonic waves falling on obstacles or preys get 'reflected' back and reach the sensitive ears of bats. Thus, they come to know what all is present around them and where their prey is. This concept is also used in shipping to determine the depth of the sea using a device called sonar. It comprises a sound transmitter, a receiver, and a clock. The time difference between sending and receiving sound waves is measured, which is used to calculate the depth of the sea.
 
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[emoji818][emoji818][emoji818]460. What happens in an atom bomb explosion?

Unlike an atomic power plant, where a chain reaction for splitting uranium is allowed to run in a controlled way, in an atomic bomb it runs at lightning speed and totally out of control. The explosion gives rise to temperature of over 10 million °C. This strong heating creates an immense pressure wave. The pressure and the heat wave destroy everything in its surroundings. Tens of thousands of people were killed immediately when the two American atom bombs were thrown on Hiroshima and Nagasaki on August 6 and August 9, 1945, respectively. The infamous 'mushroom cloud' rock up to a height of 13 km and about 20 minutes later radioactive rain fell from this cloud on the two cities. A number of people have died or have developed abnormalities which are the consequences of the radioactivity caused during the explosion.
 
459. What did the Europeans gain by exploring Africa?

With the discovery of the sea route to India, the Europeans became increasingly familiar with the continent of Africa; explorers particularly took note of its extensive and diverse natural reserves. Gold and diamonds were found in plenty in the south of Africa. The British and the Boers fought here for a good bargain. Even the Churches began to take interest in this continent and sent their missionaries deep into interior of Africa. From all over Africa, especially Timbuktu, numerous tribal people were caught and forcibly sent over to America as slaves.
 
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