Not long ago I, toured the National Air and Space Museum's immense Steven F. Udvar Center, located near Dulles airport. It's an amazing complex, but about halfway through I found myself getting strangely depressed. Most museums are fascinating not just because of the historical information they convey, but because they plainly demonstrate how far we humans have come. Imagine, for example, a museum of the telephone where the exhibits progress slowly from the crudest possible voice-communication devices to smartphones that provide us with instant access to much of humanity's accumulated knowledge ...
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