Yesterday in Palo Alto, an older man saw me and exclaimed, "You have a baby on your back!" It's a reaction I get often, and I usually just nod and smile. (Brian thinks I should say, "Shit! How'd that get there?" or something to that effect.) This man stopped me, though. "What do you call this contraption?" He studied it carefully and asked me a couple of questions about it. Then: "My stepson and his husband are adopting a baby this year. I'll have to let them know about this."