On this day: January 10
POSTED: 12:35 PM Jan 09 2013
UPDATED: 1:00 AM Jan 10 2013
Caesar crosses the Rubicon, the London Underground opens, RCA introduces the 45 rpm single, The Beatles' first U.S. record is released, and Wendy's asks "Where's the Beef?," all on this day.
Public domain
BC 49: After the Roman Senate ordered Julius Caesar to lay down his military command and return to Rome, he refuses and instead crosses the Rubicon River with a legion to march into the city itself. The move signals the start of civil war, from which Caesar would emerge as the unrivaled leader of Rome.

