Stevenson High Schools Your Brain Gray Matters app provides information about the dangers of underage drinking and marijuana use in an entertaining and engaging format. Answering 90% of the Your Brain quiz answers correctly earns you a stamp. Five stamps earn you a small prize. Stamps post automatically. Earning stamps also earns you points on the leaderboard. Redeem stamps for a prize does not affect leaderboard points. At various times throughout the year, SHS will have contests using leaderboard rank. These contests have the big prizes, so stay competitive.