National Geographic has a new feature up today in which they discuss the new finding of a cave in the midst of an unexplored Mayan megacity--a cave with very particular glyphs on the walls. Those writings include charts to predict lunar cycles and other calendrical workings--including a cyclical Mayan calendar that counts many thousands of years in the future. Which means, um, that stuff about the Maya predicting the end of the world is kind of...factually problematic.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.