Ryan Schweter, a sophomore at St. Vincent-St Mary High School, balances a 30-inch rocket on the side of his hand while his colleague, junior Katie Engels, marks the projectile's center of gravity with a pencil. From a red pickup truck behind them, a Black Keys song fills the chilly December air as the dozen St. V-M students review schematics and toss around words like "ammonium pyrophosphate."
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