In Sid Meier's classic game Civilization III, one of the first "technologies" that your chosen civilization must learn is the calendar (which, amusingly, unlocks the ability to build the Stonehenge, even if you happen to be the Chinese or Incas). As a teenager, this...
Astronomy
Evangelizing Environmentalists With Medieval Cosmology
How can retrieving a medieval cosmology help us reach an eco-conscious modern world?