Boston Calling

Cooling down our addiction to air conditioning by building a more energy efficient AC. Also, it’s a “wind, wind, wind” for cargo ships powered by sails; engineering students in Los Angeles design quality-of-life solutions for refugee camps; a navigation app helps drivers get around Nigeria; the drive to thwart diseases like malaria and dengue by altering the genes of mosquitoes. (Photo: Air conditioning units in Antwerp, Belgium on Tuesday, July 23, 2019. Credit: Dirk Waem/AFP via Getty Images)