The next four photos are from yet another 
_<A HREF="https://wikipedia.org/wiki/Chicago">Chicago_</A> class: 
from the hotel in Streeterville, the classroom downtown, 
the river by Michigan Avenue, and the Field Museum on the
lake.  Over the years, I taught 17 classes in Chicago,
second only to California's 52 (about 30 of which qualify
as the Bay Area).