How this season’s flu got supercharged — and why viruses may make you healthier. This episode was produced by Avishay Artsy, edited by Jenny Lawton, fact-checked by Melissa Hirsch, engineered by David Tatasciore, and hosted by Jonquilyn Hill.  Photo by Elisa Schu/picture alliance via Getty Images.  If you have a question, give us a call on 1-800-618-8545 or send us a note here.  Listen to Explain It to Me ad-free by becoming a Vox Member: vox.com/members.  Learn more about your ad choices. Visit podcastchoices.com/adchoices