One of the pleasures of Scientific American , I’ve always thought, is that it offers armchair travelers a vicarious expedition to the exciting worlds uncovered through science. I reflected on that fact recently as I sat on the tarmac, my flight 23rd in line for takeoff at LaGuardia Airport in New York City. I was reading over this issue’s articles and again became absorbed by our cover story, “ The First Americans ,” by Heather Pringle.
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