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… ...

The fact that our country is divided isn’t new. In many respects, it can be traced back to the founding of a nation on the promise of freedom while dependent on slavery, a time when many couldn ...