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A light emitting diode (LED) is used to shine into one end of the 'glass thread', and

a light detector is used to look for it at the other end of the thread. If the detector

can tell when the LED is shining (ON) and when it's dark (OFF), that's all it takes to

send information in the form of binary numbers from one end to the other. Anything

that can be coded in the form of binary numbers ... usually called "data" ... can be

sent through the fibre. It doesn't matter whether it's a telephone voice, a symphony,

a list of bank account balances, a TV picture with sound, a credit card transaction,

a movie, a book, a text message, a mobile app, or the front page of a newspaper.

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