Aurora shooting:
A gunman, James Holmes, opened fire in a movie theater during the premier of the Dark Night Rises in Aurora, Colorado, killing 12 people and injuring 58 others.

Viking I lands on Mars:
Part of the Viking program, Viking I became the first American spacecraft to succesfully land on Mars and to complete its mission.

Turkish invasion of Cyprus:
Also known as Cyprus Peace Operation or Operation Attila, the invasion was a response to a coup in Cyprus.