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On this day: January 10

POSTED: 10:35 AM Jan 09 2013   UPDATED: 11:00 PM Jan 09 2014

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.

OTD January 10 - Rubicon
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Public domain

49 B.C.: 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 signaled the start of civil war, from which Caesar would emerge as the unrivaled leader of Rome.

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