In Book Three of the Acadia Files series, Acadia Greene carries her search for answers into winter. A melting snowman leads her to explore climate change and how to reduce her carbon footprint. The helium balloons at her eleventh birthday party beg questions of molecular structure, weights of gases, and neutral buoyancy. An afternoon making paper airplanes brings discoveries in aerodynamics. Tracks in the snow raise questions of how animals survive winter. And an afternoon of sledding slides into an investigation of momentum, acceleration, and friction. Acadia doesn?t mean to do science?it just happens. She?s curious, determined, bold, and bright?a wonderful STEAM ambassador!