“Why are you taking medications for two weeks longer than the trip?” my husband asked when I was packing for a recent trip to Italy. “In case there’s a volcano in Iceland,” I replied, because ever since the Eyjafjallajokull volcano sent clouds of ash and dust into the atmosphere — interrupting air travel between Europe and North America by grounding more than 100,000 flights and stranding millions of passengers — I’ve packed defensively. The 2010 eruption was relatively small, but its impact was massive. Europe experienced air-travel chaos for almost a month. Although it was unlikely that anything similar would ever affect us, there was a volcano warning a few weeks before we flew to Ecuador. What I called “prudent precautions” others deemed excessive overpacking — that is until February 2020, when we were quarantined in Japan for two extra weeks on the infamous Diamond Princess cruise ship, and then …