Birding, silent book club, Mahjong and more: America's meetup explosion

Young people raised on swiping, DMing and streaming are doing something bold: going out. Why it matters: Amid a loneliness epidemic , millennials and Gen Zers are craving IRL connection — enough to show up for meetups built around activities once considered solitary, or " grandma hobbies ." The latest: They're leaving the house to play chess , birdwatch and read in silence together. "It's very…