Malinda had to work today, so I set out by bike to run my errands. The trouble I was experiencing with my 3-speed hub turned out to be loose wheel nuts (!!), so that was easy and cheap to fix. I got all the maps I needed from the central library with no trouble, and I paid my respects to the Arch.
My second attempt in a week to donate blood was foiled again by low iron -- lower than last time, even though I've been taking supplements all week and making an effort to eat more iron-rich foods. So something's wrong. I'll see what I can learn on the Internet and try again in Bartlesville.