re: Only 100 years ago

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the changes over those 100 years are massive. I suspect that would be pretty true of any 100 year period in the history of man

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Not really. There were huge advances, like gunpowder and steel, but people's way of life could stay largely the same from generation to generation over most 100 year periods. Older generations being left behind by their children and grandchildren technologically is a very new phenomenon.

The crazy thing about it is that we are advancing exponentially, rather than linearly.