I learned a lot about aging by watching this Minecraft video[^1] and building the kelp farm. That farm stops working after some (long) time, given the way that

I learned a lot about aging by watching this Minecraft video[^1] and building the kelp farm. That farm stops working after some (long) time, given the way that kelp grows in Minecraft. If Avomance had done the math beforehand, he would have discovered that he needs a costly full row of observers for the farm to work forever. Biological systems are not designed, but evolved, and evolution ends up selecting systems (which we call "organisms" or "individuals") which are good enough for it to be reproductively successful. In practice that means "low-maintenance" and "energy-efficient". Functional errors and their organism-wide effects slowly accumulate, and although our biology has everything material it needs to fix each and every error[^2], its healing program/intelligence is far from perfect. [^1]: https://www.youtube.com/watch?v=Sf9I3YORSzM https://www.youtube.com/watch?v=Sf9I3YORSzM [^2]: Compare this with a car, for example. If your lights go bust, the car won't grow a new one; you need to change them. But biological organisms have a lot of self-healing capability.