Mental Floss

WAR

National Photo Company, Library of Congress, Wikimedia Commons // No known copyright restrictions

Like other flu epidemics, the 1918 H1N1 virus, also known as swine flu, was a zoonosis—a disease that spreads from animals to humans.

Erik Sass








iStock

One missing letter led to the Ministry of Defence accidentally hiring a seaweed expert instead of a codebreaker. Turns out that's just what they needed.

Jake Rossen




HBO

9. James McAvoy, Tom Hardy, Simon Pegg, Michael Fassbender, Colin Hanks, Dominic Cooper, and Andrew Scott were among some of the up-and-coming actors who appeared in it.

Matthew Jackson






Anne S. K. Brown Collection at Brown University, Wikimedia Commons // Public Domain

That fact that Benedict Arnold defected to the British Army in 1780 is common knowledge. But before he switched allegiances, he led a pretty interesting life.

Mark Mancini