US

Members of the The Fort McHenry Guard Field Musicians perform at the base of the Battle Monument during the Star Spangled Spectacular September 12, 2014 in Baltimore, Maryland. Celebrating the 200th anniversary of the United States' national anthem, Baltimore's Inner Harbor will host tall ships, fireworks displays, concerts, historic tours and other events. The anthem's lyrics come from 'Defence of Fort M'Henry,' a poem written in 1814 by Francis Scott Key after he witnessed the bombardment of Fort McHenry by British ships during the War of 1812.

Chip Somodevilla/Getty Images

Members of the The Fort McHenry Guard Field Musicians perform at the base of the Battle Monument during the Star Spangled Spectacular on Friday in Baltimore, Maryland. Celebrating the 200th anniversary of the United States’ national anthem, Baltimore’s Inner Harbor will host tall ships, fireworks displays, concerts, historic tours and other events

South Korean special police officers descend the stairs from subway station during an anti-terror exercise as part of Ulchi Freedom Guardian or UFG in Seoul, South Korea.

Lee Jin-man/AP

South Korean special police officers enter a subway station in Seoul, South Korea, during an anti-terror exercise as part of Ulchi Freedom Guardian, an annual joint military operation between South Korea and the US

Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri...Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters on Monday after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)

Joshua Lott/Reuters

Police officers aim their weapons at demonstrators, having fired tear gas and stun grenades at protesters in Ferguson, Missouri. Read more

A military honor guard prepares for US Chief of Naval Operations Admiral Jonathan Greenert's visit with Commander in Chief of The People's Liberation Army (PLA) Navy Admiral Wu Shengli at a welcoming ceremony at the PLA Navy headquarters outside of Beijing, China, 15 July 2014.  For the first time since 1971 China's navy participated alongside the US navy in Rim of the Pacific naval exercises last week.

Stephen Shaver/EPA

A military honour guard prepares for US chief of naval operations Jonathan Greenert’s visit with commander-in-chief of The People’s Liberation Army (PLA) Wu Shengli at a welcoming ceremony at the PLA navy headquarters outside of Beijing, China

A Chinese woman adjusts the Chinese national flag near U.S. national flags before a Strategic Dialogue expanded meeting that's part of the U.S.-China Strategic and Economic Dialogue at the Diaoyutai State Guesthouse in Beijing, Thursday, July 10, 2014.

Ng Han Guan/AP

The US and Chinese national flags are prepared ahead of a meeting that forms part of the US-China Strategic and Economic Dialogue at Diaoyutai State Guesthouse in Beijing on Thursday.

University of Utah image of a map of the northern sky showing the "hot spot" where scientists detected an unusual concentration of high energy cosmic rays. PRESS ASSOCIATION Photo. Issue date: Tuesday July 8, 2014. A mysterious "hot spot" in the sky is emitting unusual numbers of powerful cosmic rays, say scientists. The discovery may shed new light on the origin of ultra-high energy cosmic rays, which still cannot be fully explained. The hot spot is centred two hand-widths below the "handle" of the Big Dipper, or Plough, an arrangement of seven stars within the Great Bear constellation.

Ben Stokes/University of Utah/PA

University of Utah image of a map of the northern sky showing the ‘hot spot’ where scientists say they are detecting an unusual concentration of high energy cosmic rays

A monsoon lightning storm strikes over the Mandalay Bay Resorts and Casino and Luxor hotels in Las Vegas, Nevada late July 7, 2014. Monsoon storms are forecast for the the rest of the week in the Nevada and Arizona states.  The Luxor Sky Beam can be seen shining into the sky from the top of the hotel's pyramid structure.

Gene Blevins/Reuters

A monsoon lightning storm strikes over the Mandalay Bay Resorts and Casino in Las Vegas, Nevada. Monsoon storms are forecast for the rest of the week in Nevada and neighbouring Arizona.

An antique car drives down Main street during a July Fourth parade in the village of Barnstable, Massachusetts July 4, 2014. Barnstable, which is located on Cape Cod in Massachusetts and was first settled in 1639, is celebrating its 375th anniversary in 2014.

Mike Segar /Reuters

An antique car drives down Main street during a July Fourth parade in the village of Barnstable, Massachusetts. Barnstable, which is located on Cape Cod in Massachusetts and was first settled in 1639, is celebrating its 375th anniversary

A man crosses a flooded Highway 64 as wind pushes water over the road as Hurricane Arthur passes through Nags Head, N.C., Friday, July 4, 2014.

Gerry Broome/AP

A man crosses the flooded Highway 64 as wind pushes water over the road as Hurricane Arthur passes through Nags Head, North Carolina on Friday morning

Wyatt Smith of Rexburg, Idaho, slides in the dirt as he pulls down a steer for a time of 4.3 seconds during the steer wrestling competition at Greeley Stampede Arena on Tuesday, July 1, 2014, in Greeley, Colo.

Greeley Tribune/Jim Rydbom/AP

Wyatt Smith of Rexburg, Idaho, slides in the dirt as he pulls down a steer in a time of 4.3 seconds during the steer wrestling competition at Greeley Stampede Arena in Colorado