We all survey the vastness of space with a certain amount of wonder and awe. Exploring and understanding the cosmos requires units to express its size — including volume. But because of that vastness, ...

Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

[Colin] and [Fergus] have been working with GPS for years now, and like most builders of really cool things, they’re often limited by the precision of off-the-shelf GPS units. While a GPS receiver is ...