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What is a Black Box?

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T he black box is the common name for the flight data recorder, a device carried in an aircraft. Its purpose is to give the cause of faults if these develop in flight . It gives information about a plane's heading, height, air speed, rate of descent , etc. This recorder is encased in a crash proof, fireproof, floatable box. In case of a casualty, the black box remains safe and is recovered later. The information are recorded in binary code. Besides a flight recorder, a plane also carries a cockpit voice recorder which records the conversation going on in the cockpit. In case of a crash, both the recorders prove to be very useful for analysing the cause of crash and helping designers to produce safer planes.
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Where did Cricket Originate?

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Cricket is an old English game. It used to be played with curved bats and no wickets in 1300s. But by early 19th century, the game was played quite like the way it is played now. There are two ends of the wicket. Distance between the wickets is 22 yards (20 metres). Each end has a set of three wickets , each wicket's height is 28 inches and they are placed at the width of nine inches. Cricket originated in India during British rule. The ball weighs between 51/2 to 53/4 ounces and the bat is about 41/4 inches wide. English settlers spread the game wherever they colonized and it is now an international game. The cricket 'World Cup' is played after every four years.
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Why are Railway Signals Important?

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R ailway signals control the movement of trains. They help to keep the trains away from each other to avoid collisions and also keep them running efficiently and on time. The block is the basis of a signalling system. It is a stretch of line in one direction. No more than one train can be in a block at a time . A stop signal controls entry into the block. If it is red, the driver has to stop there. A distant signal before the start of a block warns the driver of what the stop signal will show, so if necessary, he can start to slow down.
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Why Does Google Celebrate Its Birthday on September 27?

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  Google celebrates its birthday on September 27, but that is not the date when the company was officially incorporated. Google Inc. was incorporated on September 4, 1998, after Larry Page and Sergey Brin developed their search project at Stanford. The birthday date was not always September 27. During Google's early years, birthday celebrations appeared on several different September dates. The company eventually settled on September 27, and the date has been used consistently for its public birthday celebrations since the mid-2000s. The exact history is unusual enough that even Google has acknowledged that its birthday has not always had a single clear date. September 27 is therefore best understood as Google's traditional celebration date, while September 4, 1998 remains the company's incorporation date. In 2026, Google's September 27 celebration marks 28 years since the company was incorporated.
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