On this day: July 13

POSTED: 09:23 AM PDT Jul 09, 2012    UPDATED: 11:00 PM PDT Jul 12, 2012 
Hollywoodland sign, Hollywood

The Mississippi River finds its roots, a Hollywood icon debuts, Old Blue Eyes records for the first time, the MLB All-Star Game goes north, and Ronald Reagan gives up the presidency, briefly, all on this day.