The warm-up game for 93 8th graders is simple. Pick one of three words: “stop,” “go,” or “listen.” When it’s your turn, stand up and face your peers, then speak your word loudly and clearly. Sit down, and it’s on to the next student. The game’s coach and referee is Kairav Sinha, a first-year Williams student who’s reshaping the public speaking curriculum at Williamstown’s Mt. Greylock Regional School.