I had a most wonderful time in Philadelphia, making new friends -- really! And teaching a class of people who amazed themselves with what they could do in only one day with "what if?" and no ruler.
Tonight, I played around with another "what if?" and ended up with two experiments that are a germ of an idea which may or may not be successful. I'll work on it in Florida.
time to sign off -- Blogger is still being weird. (see what I mean??)