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A lot can happen in a century. Especially if the pace of advancement equals that of the 19th and 20th centuries.
1801 there were no steam ship or railroads.
1901 there were no airplanes.
What will there be that did exist in 2001 that will be common use by 2101
(Come to think of is, what is there that is advanced potentially common use thing that didn't exist in 2001 that exists now, since the other two examples happened early in the centuries)
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