I'm dancing on the top deck with a 71-year-old feminist and psychotherapist whom I've come to think of as the Twirler. We've spent two days attending seminars on The Nation magazine's Alaska cruise; we've talked about the Bush presidency and prison reform and single-payer health care. Now, at almost midnight, my fiercely intelligent and opinionated new friend is putting all the heady political talk behind her by bodily twirling. "If I start to get dizzy, then I twirl in the opposite direction," Charlotte tells me as the live band revs up its throbbing Motown beat. "I won't fall." "Good, please...