On this day: January 10

POSTED: 11:35 AM MST Jan 09, 2013    UPDATED: 12:00 AM MST Jan 10, 2013 
Wendy's 'Where's the Beef' commercial

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.