Did a volcanic eruption in Alaska help end the Roman republic?

Julius Caesar was assassinated on the Ides of March (March 15) in 44 BC and a bloody civil war followed. This brought down the Roman republic and replaced it with a monarchy led by Caesar's nephew Octavian, who in 27 BC became ...

What Paris shows us about the history of photography

Imagine a photo of Paris you've seen before, whether it's the Eiffel Tower or an urchin carrying a baguette. Have you ever considered the story behind that picture—why it was taken, and why it's in circulation today?