On this day:

1960 Baghdad Conference Begins ending with creation of Organization of the Petroleum Exporting Countries (OPEC)

2008 Large Hadron Collider, the world’s largest particle collider, goes live

2014 First Invictus Games, the international games which bring together wounded armed forces personnel and veterans, held

Born on this day:

1839 Charles Sanders Peirce, American philosopher, mathematician, scientist

1872 Ranjitsinhji, Indian cricketer

1941 Stephen Jay Gould, American paleontologist