Drawing of the bottom section of De Dondi’s astronomical clock. Giovanni de Dondi. These weren’t the accurate clocks we see today – they probably kept time to within 15-30 minutes a day.

Heather, the chair of medieval history at King's College London, is the author of Christendom: The Triumph of Religion, AD 300-1300 For the first millennium of Christianity’s existence, western ...

Now that we’re done celebrating Presidents Day, and by that I mean enjoying a day off, let’s consider some of George Washington’s contributions. Father of our country, leader of t… ...