I think the best descriptor I've heard for a sense of scale about time is from Bryson's Brief History of Nearly Everything where he says that if you stretch you arms out either side of you, humans have been around for about the length of the growth on one of your fingernails.
The last hundred or so years really need more points in it to give a better indication of the acceleration of recent human developments. The telegraph to represent speeded up communications, not to mention flight, space-flight, computers, the cracking of DNA, etc.
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