This Day, That Year – March 21

Albert Kahn, the inventor of modern factory design, was an architect born on this day in 1869.

Did you know that:

• George David Birkhoff was an American mathematician born on this day in 1884, best known for the ergodic theorem
• Gary Oldman is an English actor and filmmaker born on this day in 1958
• The world’s first tweet was sent by the founder of Twitter, Jack Dorsey, on this day in 2006