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Activity:
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First, introduce the idea of a bit.
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Then tell students to the number of bits in a Byte, a Kilobyte, a Megabyte, a Gigabyte, and a Terabyte.
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Have students look at the size of different files to see if they can find examples of files that have the units KB, GB etc.
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A fun joke you can make is to introduce a Nibble (4 bits):
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Ask students what is half of a byte? Explain that if you had a cookie and were going to share half of a bite that would it be a Nibble: http://en.wikipedia.org/wiki/Nibble