Dr. Sweeney was a treasure. Kind, funny, smart, and did I mention funny? His analogies were always memorable, from kittens and piranhas to capillary action. They made you laugh, but they made you remember. He was also the first person of authority I ever heard answer a question with, "I don't know. ...but I'll find out and get back to you." That is a lesson I carry with me to this day. It's OK not to know. Thanks, Dr. Sweeney. You will be missed.