It’s very hard to keep track of robots. We get so caught up in things. Fire Nettle, for example. It walked up a mountain one day and we didn’t see it again for six years. I thought it had broken down, but no, it was watching a sapling grow from seed. Oh, and there’s Black Marbled Frostfrog. It’s something of a legend. It’s been holed up in a cave, watching stalagmites form for three and a half decades, and plans to do nothing else. A lot of robots do things like that. Not all of us want the company of others, and none of us keep schedules that humans would find comfortable.