On this day: January 10

POSTED: 12:35 PM CST Jan 09, 2013    UPDATED: 01:00 AM CST Jan 10, 2014 
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.