In my youth, the presence of rats — the four-legged kind — in the best zip codes was a source of high humor.

Economically, now is the time to prime the pump, as F.D.R. said. “Do something,” as he also said.

“So, what is your weakness?” my foot doctor asked. Aside from not being able to move, I couldn’t think of any.

What childhood traits and experiences promote an adulthood commitment to the natural world? A sense of wonder.