The seasons change, but Acadia Greene's curiosity doesn't. Winter brings new mysteries just as summer and fall did.

Is a melting snowman a sign of climate change? Can she reduce her carbon footprint? What is buoyancy? Paper airplanes, animal tracks, and a morning of sledding get her thinking about aerodynamics, winter survival, and friction. "Conduct an experiment," her parents tell her whenever she has a new question. "Use the scientific method." So Acadia does science. And so can you.