2015: A suicide bomb attack kills at least 15 people at a mosque in the Saudi city of Abha.
2012: NASA's Curiosity rover lands on the surface of Mars.
2011: War in Afghanistan: A United States military helicopter is shot down, killing 30 American special forces members and a working dog, 7 Afghan soldiers, and 1 Afghan civilian. It was the deadliest single event for the United States in the War in Afghanistan.
2010: Flash floods across a large part of Jammu and Kashmir, India, damages 71 towns and kills at least 255 people.
1986: A low-pressure system that redeveloped off the New South Wales coast dumps a record 328 millimeters (13 inches) of rain in a day on Sydney, New South Wales, Australia.
1945: World War II: Hiroshima, Japan is devastated when the atomic bomb "Little Boy" is dropped by the United States B-29 Enola Gay. Around 70,000 people are killed instantly, and some tens of thousands die in subsequent years from burns and radiation poisoning.
1944: The Warsaw Uprising occurs on August 1. It is brutally suppressed and all able-bodied men in Kraków are detained afterwards to prevent a similar uprising, the Kraków Uprising, that was planned but never carried out.
1915: World War I: Battle of Sari Bair: The Allies mount a diversionary attack timed to coincide with a major Allied landing of reinforcements at Suvla Bay.
1914: World War I: Serbia declares war on Germany; Austria declares war on Russia.