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474. How are bubbles formed in boiling water?

At room temperature, there is always some air dissolved in water. The colder the water, the more air is dissolved. Air becomes less soluble in water as the temperature rises. When the water boils the air is released in the form of bubbles. Two thousand years ago, an attempt was made to use the power of steam with Heron's ball, but the great breakthrough came only with the steam engines. The steam engine improved by James Watt is the most well-known. A little later the steam engines were used to drive locomotives and paddle steamers – the modern steam turbines followed later.
 
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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.
 
454. What is Cyber Terrorism ?

Cyber terrorism is the use of Internet based terror attacks, done deliberately in order to create disturbances or havoc in usual working of the internet. Since, many computers are connected through internet, the chances of high disruption in computer related services in personal as well commercial devices. Attacks through cyber terrorism can be in form of various illegal activities whose number is on a constant increase, a few are most lethal and common. These include attacks from viruses, attacks from Trojans, attacks from BOTS, attacks on databases, black hat hacking etc.
 
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