Coronavirus could travel 27 feet, stay in air for hours: MIT researcher New York Post Coronavirus can travel 27 feet, MIT researcher says The Columbus DispatchSix-foot rule to protect against coronavirus is questionable, MIT professor says The Boston GlobeCoronavirus social distancing: New study suggests staying 20-plus feet from others might be best, not 6 PennLiveIs 6 feet enough for social distancing?