Keep within a water budget. Learners find out that less than 2.5% of Earth's water is available to drink—and that there is a fixed amount of water. Scholars read an interesting article comparing the available water to a game of Monopoly...

The vibrant network opened up exchanges between far-flung cultures throughout central Eurasia. The Silk Road wasn't a single route, but rather a vibrant trade network that crisscrossed central Eurasia for centuries, bringing far-flung...

Find out about historical events leading to the creation of the atomic bomb, beginning with ancient history.

A wonderful illustrated article that describes various glass forms created over the years, from ancient times through the eleventh century A.D. Intriguing videos on ancient glassmaking techniques accompany the article, making this an...

A team of researchers at the Massachusetts Institute of Technology investigated whether the ancient Egyptians could have used a synthetic concrete for the huge stones used in building the pyramids. The theory has met enormous resistance...