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Last week I flew to a conference in Kentucky. After reading all of the precautions about traveling, I dutifully wiped down my airplane seat and tray table and packed extra hand sanitizer. But when I got to the conference the following morning, I found myself in an awkward situation. Many of the people I met, after introducing themselves, put out their hand for a hand shake. The first few times it happened, afraid of offending anyone, I shook their hand (and then beelined for the hand-sanitizer station). But after a while I got more comfortable declining the offer — sometimes verbally and sometimes in more subtle ways. And given how rapidly the Covid-19 situation is evolving, I’m glad I did.