Most of us have little trouble working out how many milliliters are in 2.4 liters of water (it's 2,400). But the same can't be said when we're asked how many minutes are in 2.4 hours (it's 144).

A small, broken ceramic figurine from Guatemala's Pacific coast may hold the oldest known example of written numbers in Mesoamerica. The object, found at the ancient Preclassic site of La Blanca in ...

In the remote Arctic almost 30 years ago, a group of Inuit middle school students and their teacher invented the Western Hemisphere's first new numeral system in more than a century. The “Kaktovik ...