Speed of light

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Numbers

NUMBERS

The item in the photo should be familiar to many of us, though it is not widely used anymore. It would be familiar to Jesus, and his disciple Matthew who likely owned one of his own, since he was a tax collector. The item is an abacus which predates Christianity by many centuries. There are also various versions of this instrument used in counting. For example, it may have been more convenient in the Old West to use knots in...

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