Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

First exhibited in 1878, Charles F. Ritchel’s dirigible was about as wacky, dangerous and impractical as any airship ever launched Erik Ofgang - History Correspondent “When I was making it, people ...

Leonardo da Vinci was, by any metric, a genius – but he was still limited by his time. The man may have been a secret authority on anatomy, music, art, engineering, and even frickin’ paleogeography, ...