The absence of a golden rule for mattress flipping is a disappointment, but it does not pertend the demise of civilization. We can adapt; we can lear… - Brian Hayes

I am reminded of those prodigies who spent years of their lives calculating digits of the decimal expansion of <math>pi</math> - a task that is now a mere warm-up exercise for computer software. I cannot help wandering which of my labors will appear equally quaint and pathetic to some future reader who ransacks libraries for old volumes like this one.

The condensation of all property in the hands of one individual is an economic catastrophe-something like the formation of a black hole in astrophysics. It's obviously bad news for the majority of the people, who are left penniless. But even if you happen to be the big winner, your victory may prove hollow. Although you have all the riches in the world, you can't buy a thing, because no one else has goods to sell.

A big advantage of the serial-number approach to identity is that things stay the same even as they change.