On this day: October 4

Published On: Oct 03 2012 08:01:41 PM EDT   Updated On: Oct 04 2013 02:00:00 AM EDT

Work begins on Mount Rushmore, Sputnik is launched into space, the pope visits America for the first time, Janis Joplin is found dead of an overdose, all on this day.

OTD October 4 - Gregorian calendar
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1582: Pope Gregory XIII implements the Gregorian Calendar. In Italy, Poland, Portugal and Spain, Oct. 4 of this year was followed directly by Oct. 15.