Why Are Manchester United Called the Red Devils?

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Manchester United’s “Red Devils” nickname came from nearby Salford’s rugby league team and was adopted under manager Sir Matt Busby in the 1960s. The connection links two different sports through a shared local nickname. UEFA’s account traces Salford’s name to a French journalist who called the team “Les Diables Rouges” in 1934. That phrase means “the Red Devils.” UEFA says Busby later took a liking to the name. The Premier League’s crest history also credits him with adopting it from Salford. The nickname became a visual part of United’s identity: its badge includes a red devil holding a pitchfork below a three-masted ship. The ship has a separate origin in Manchester’s coat of arms and trading history. A single crest therefore combines a symbol of the city with a nickname borrowed from its sporting neighbourhood.  
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How does a Telephone Work?

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Telephone was invented by Alexander Graham Bell in 1876. It transmits speech in the form of electric currents. The mouth piece of a telephone contains a small carbon microphone. The sound waves produced by our voice make a metallic diaphragm vibrate which squeezes the carbon granules of the microphone. An electric current flows through the microphone and the granules vary its strength as we speak. This varying current then flows along wires to the telephone exchange, which sends it on to the other telephone. There it enters a small loudspeaker in the earpiece. The earpiece contains an electromagnet which causes a diaphragm to vibrate as the incoming current varies. This produces the sound of our voice.
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