America is experiencing a loneliness epidemic, says U.S. Surgeon General Vivek H. Murthy, MD, who warns that the emotion is linked to heart disease, stroke, dementia, and premature death. The prescription is connection, even if it’s fleetingly forged with a stranger, says Niro Feliciano, a certified cognitive therapist and the author of This Book Won’t Make You Happy. “Friendly interactions increase the levels of certain mood-elevating hormones in our brain, which encourages prosocial behavior,” she says. Meaning: We’re more likely to be friendlier to other people in turn. If you find it hard to chat with strangers, try simply complimenting their outfit, commenting on the book/dog/baby they’re holding, or commiserating about the pharmacy line. Don’t be deterred by a person staring into their phone, Feliciano says: “If you have something…