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On this day: April 18

Published On: Apr 16 2013 03:57:58 PM CDT   Updated On: Apr 18 2014 01:00:00 AM CDT

Paul Revere rides, an earthquake and fires ravage San Francisco, Albert Einstein dies, Grace Kelly becomes a princess, and the U.S. embassy in Beirut is hit by a deadly car bomb, all on this day.

OTD April 18 - Conan O'Brien
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Adrees Latif/Reuters

1963: Comedian and talk show host Conan O'Brien is born in Brookline, Mass. The former TV writer for "Saturday Night Live" and "The Simpsons" was tabbed to replace David Letterman on "Late Night" in 1993. O'Brien left "Late Night" to take over for Jay Leno on "The Tonight Show" in 2009, but lasted only seven months before NBC brought Leno back. He debuted his new late-night talk show, "Conan," on TBS in 2010.

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