The U.S. Air Force Academy Class of 2015 tosses their hats in celebration as the U.S. Air Force Thunderbirds roar over Falcon Stadium in Colorado Springs, Colorado, on May 28, 2015. Over 800 cadets graduated and became second lieutenants. Deborah Lee James, the Secretary of the Air Force, gave the graduation address. #

Top left: Ankita Vadiala of Manassas, Virginia, reacts to the word "ballabile", which she spelled correctly, during the semi-final round of the 88th annual Scripps National Spelling Bee at National Harbor, Maryland, on May 28, 2015.  Lower left: Sean Fogerty of Tokyo, Japan, misses “sortition” in the third round of the National Spelling Bee on May 27, 2015. Right: Hailey Hogenson, of Ludington, Michigan, reacts to misspelling the word "intussusception" during the National Spelling Bee on May 27, 2015. #

Activists from the international campaigning and advocacy organization ONE install illuminated balloons with portraits of the G7 heads of state in front of the Frauenkirche cathedral (Church of Our Lady) prior the G7 Finance Ministers meeting in Dresden, Germany, on May 27, 2015. #

Workers tend to equipmant used to pump water from Padera Lake on May 27, 2015 in Midlothian, Texas. Officials feared that the temporary dam on Padera Lake would fail due to recent heavy rains in the area. Areas throughout Texas experienced flash flooding and numerous deaths due to weeks of heavy rainfall. #

Workers move the Gay Head Lighthouse about 50 feet from its original footing (at center between the rails) in Aquinnah, Massachusetts, on the island of Martha's Vineyard, on May 28, 2015. The 160-year-old lighthouse started its gradual 135-foot march to a new home slightly further inland. The $3.4 million effort to move and save the structure was due to fear that it could tumble down a rapidly-eroding cliffside. #

A woman takes a selfie with a smartphone in a pistol grip case, as she attends the Monaco Formula One Grand Prix at the Monaco street circuit in Monte-Carlo on May 24, 2015. #

A bridge is destroyed by rushing water of an overflowing river after heavy rainfall hit Leishan county, Guizhou province, China, on May 27, 2015. Leishan county lost power and water supplies after torrential rain battered the area on Tuesday and Wednesday, Xinhua News Agency reported. #

The Wolf volcano spews smoke and lava on Isabela Island, in this May 25, 2015 photograph provided by the Galapagos National Park. A volcano perched atop one of Ecuador's Galapagos Islands erupted in the early hours of Monday, potentially threatening a unique species of pink iguanas. #

Rescued baby iguanas sit in a cardboard box in an office of the Ministry of Environment in San Jose, Costa Rica, on May 25, 2015. Officers from the national police force rescued 81 iguanas that had been confined to a box at a hotel in San Jose. It is presumed that the captive iguanas were the subject of an exotic pet smuggling effort, according to a press release issued by the Ministry of Public Security. The Ministry of the Environment rehabilitated the iguanas in a natural habitat. #

A Bangladeshi migrant calls his family from a shelter in Langsa, Indonesia, on May 24, 2015. Indonesia conducted search and rescue operations for stranded migrant boats carrying Bangladeshis and ethnic Rohingya from Myanmar, an official said on May 24, after it dropped a hardline policy of refusing them sanctuary. #

Policemen hold a motorcycle as one of their colleagues catches fire after being hit by a Molotov cocktail during a protest to mark the eight-month anniversary of the Ayotzinapa students' disappearance in Mexico City on May 26, 2015. The students' disappearance on the night of September 26, 2014 in the southwestern city of Iguala triggered massive protests in Mexico and calls for justice. Officials say they were abducted by corrupt police officers, who handed them over to a local drug gang. #

A Saiga antelope with a baby grazes next to dozens of carcasses of dead antelopes lying in a field in the Zholoba area of the Kostanay region of Kazakhstan, on May 20, 2015. About 20,000 endangered Saiga antelopes, killed by a suspected pasteurellosis infection, were found dead in Kazakhstan in a week, local media reported. #

Smoke billows from a burning fuel truck after it was set ablaze during clashes between Houthis and fighters of the Popular Resistance Committees in Yemen's southwestern city of Taiz on May 25, 2015. #

A dinghy overcrowded with Afghan migrants lands at a beach on the Greek island of Kos after crossing a part of the south-eastern Aegean Sea between Turkey and Greece in bad weather on May 27, 2015. #

County Common Pleas Court Judge John O'Donnell points to mannequins marked with the gunshot wounds that two motorists suffered on May 23, 2015, in Cleveland, Ohio. Michael Brelo, a patrolman charged in the shooting deaths of two unarmed suspects during a 137-shot barrage of gunfire was acquitted Saturday in a case that helped prompt the U.S. Department of Justice determine the city police department had a history of using excessive force and violating civil rights. #

A homosexual man stands in the corner of a room as a goat hangs from a rope nearby waiting to be slaughtered by a shaman during a ritual at his sanctuary in Saltillo, Mexico, on May 22, 2015. Joaquin, a shaman who says he can cure homosexuality, offers a 20-minute ceremony in which he slaughters a black goat to pour its blood over the genitalia of the man who said wanted to be cured of homosexuality, while reading prayers for that purpose, local media reported. #

A member of a demolition crew dodges a bottle as it shatters after being thrown by residents during the demolition of a squatters' community at suburban Caloocan city, north of Manila, Philippines on May 26, 2015. Population growth, poverty and lack of economic opportunities in rural areas have driven millions of Filipinos to urban areas, many settling in squatters’ colonies that dot the sprawling metropolitan area in and around Manila. Most of the land they occupy is privately owned, and clearing the dwellings often result in violence. According to a residents, the area is home to approximately 500 families, with some having lived there for 50 years. #

Buddhist monks march to collect alms during an assembly to mark Buddha's birthday in Hangzhou, Zhejiang province, China, on May 25, 2015. Over 630 monks from the local Buddhist temples participated in a march on Monday to celebrate the birthday of Gautama Buddha, which falls on the eighth day of the fourth month in the Chinese lunar calendar. All the collected alms will be donated to charity organizations, local media reported. #

The Dalesman  crosses the 24 arch Ribblehead Viaduct, erected in 1875, in the Yorkshire Dales national park near Ingleton, England, on May 26, 2015. The Dalesman steam train runs a weekly service along the Settle-Carlisle line. #

People stand by part of a Saudi fighter jet found in Bani Harith district north of Yemen's capital Sanaa on May 24, 2015. Local media said that the Houthi rebels brought down a Saudi F-16 fighter jet north of Sanaa early on Sunday. #

Visitors experience walking on a 180-meter long, 300-meter high, musical glass plank road at Shiniuzhai scenic spot in Pingjiang County on May 27, 2015, in Yueyang, Hunan province, China. The plank road contains electronic components which produce sounds and different notes according to visitor's footsteps. #

An Indian man rests inside a concrete pipe on a hot summer day in Hyderabad, India, on May 27, 2015. Hundreds of people have died in southern India since the middle of April as soaring summer temperatures scorch the country. #

Staff and volunteers work to clean oil off a brown pelican at the International Bird Rescue center in San Pedro, Los Angeles, California, on May 22, 2015. As much as 2,500 barrels (105,000 gallons) of crude oil, according to latest estimates, gushed onto San Refugio State Beach and into the Pacific west of Santa Barbara when an underground pipeline running parallel to a coastal highway there inexplicably burst the previous week. #

A boy holds a rifle while attending celebrations with his brother, marking the 25th anniversary of Yemen's unification, in Sanaa, on May 23, 2015. North and South Yemen were formally united in 1990. #

An Indian passenger takes a bath beside rail tracks on a hot summer day at a railway station in Jammu, India, on May 25, 2015. Severe heat wave conditions continue to prevail at several places in northern India with temperatures reaching 48 degrees Celsius (118 degrees Fahrenheit). #

Rebel fighters from the Ahrar al-Sham Islamic Movement walk on a hill in Jabal al-Arbaeen, Syria, which overlooks the northern town of Ariha, one of the last government strongholds in the Idlib province, on May 26, 2015. #

A man stands on a paddleboard as haze and sand cover the Mediterranean sea off Tel Aviv, Israel on May 27, 2015. The temperature was about 42 degrees Celsius (107 degrees Fahrenheit) in the Israeli city with a heat wave across the Middle East. #