Today in History: October 4: In 1927, sculptor Gutzon Borglum began construction on Mount Rushmore; In 1777, Gen. George Washington’s troops launched an assault on the British at Germantown, Pennsylvania; In 1957, the Space Age began as the Soviet Union launched Sputnik 1; In 1970, rock singer Janis Joplin was found dead; In 2004, the SpaceShipOne rocket plane broke through Earth’s atmosphere to the edge of space;