21 Ways Neil Patrick Harris Is Still a Kid at Heart

AS PRENATURALLY SMART teen surgeon Doogie Howser, M.D., Neil Patrick Harris occasionally let himself believe he was the “young whippersnapper intellect” he portrayed on TV. He’s under no such delusions as the host of NBC’s “Genius Junior,” a new game show premiering this month that quizzes grade schoolers in categories including math, memory and spelling.

“When I interacted with the kids, I realized that [compared to them] I was really just a puppet reading writers’ lines,” the 44-year-old father of two said. “It doesn’t...