Stella and Jojo are two curious kids who love to learn about the world around them. In this first book, they meet their heavenly friend, Saint John Paul II for a hike and learn about the fundamentals of physics along the way.

As Jojo battles exhaustion up the steep hill, the kids learn about Matter, Energy, and Forces. Then, as they begin their descent they experience the laws of motion, gravity, and friction.

Their journey continues as they experience the different ways forces work. And as the sun starts to set, they learn about electricity, the different types of energy, and the science of light and color.