We’re born with trillions of cells and every ten years or so they’re all replaced by new ones. We go from an original to a copy to a copy of a copy to a copy of a copy of a copy and so on. Flaws set in, weaknesses emerge, the system teeters at the point of collapse. But there’s an odd beauty in the decline, in truly knowing how things fall apart. Eventually we’ll figure out how to slow the process–or stop it. That will be good, but it will be different.