went tonight to hear son M lecture on elephants (pictured). He spoke about three families of "elephant" -- mammoths, mastodons, and elephants -- of which only the elephants still exist today. He also spoke about the reasons why (as best we know) mammoths and mastodons are gone. He is now close to completing a doctorate, on elephants. OBSERVATION: A woman at the door said to me: "The speaker is permitted to have one free guest. He designated his girlfriend." His father ignominiously had to pay.