Childhood secrets are hiding in the dirt. Months after crops are harvested and fields stripped to bare brown, the slanted rays of morning or evening sunlight fire large circular patterns of crushed ...

A neatly designed electromechanical clock shared on YouTube is drawing interest from hobbyists and electronics enthusiasts alike. The project is inspired by the marble clock concept originally created ...

Clocks come in many styles and sizes, with perhaps the most visually pleasing ones involving marbles. Watching these little spheres obey gravity and form clearly readable numbers on a clock has ...

Part of our NPR Ed series on why people play and how play relates to learning. For me, there was no other childhood experience that taught me more about math or about life than those shiny, wonderful, ...