Miley Cyrus performs at the Tacoma Dome, in Tacoma, Wash. The concert was the first stop in the U.S. for her Bangerz tour, on February 16, 2014. (Photo by Thomas Soerenes/The News Tribune)

A women jump to reach a rock as she crosses Chepay River at Sapay, Achham in the Far-Western region of Nepal, around 900 km (559 miles) from Kathmandu February 17, 2014. (Photo by Navesh Chitrakar/Reuters)

Pamela Rauseo performs CPR on her nephew, 5-month-old Sebastian de la Cruz, after pulling her SUV over on the side of the road along Florida State Road 836 in Miami, on February 20, 2014. (Photo by Al Diaz/Miami Herald/MCT)

Sweetwater officer Amauris Bastidas helps with the rescue of de la Cruz, who had stopped breathing. Lucila Godoy, who stopped her car to assist in the rescue, comforts de la Cruz's aunt, Pamela Rauseo. (Photo by Al Diaz/Miami Herald/MCT)

A model walks the runway at the Nasir Mazhar show at London Fashion Week AW14 at Somerset House on February 14, 2014 in London, England. (Photo by Tristan Fewings/Getty Images)

Slovakia's Anastasiya Kuzmina shooting in the Women's 12.5km Mass Start Biathlon during the 2014 Sochi Olympic Games in Sochi, Russia, on February 17, 2014. (Photo by David Davies/PA Wire)

A young woman poses for a picture under the columns of Urban Lights in front of the Los Angeles County Museum of Art in Los Angeles, California on February 16, 2014. Urban Light, favorite place for portraits of wedding photographers, is a 2008 large-scale assemblage sculpture by Chris Burden. The installation consists of 202 restored street lamps from the 1920s and 1930s. Most of them once lit the streets of Southern California. The cast iron street lamps are of 17 styles, which vary depending on the municipality that commissioned them. They range from about 20 to 30 feet (6 to 9 meters), are painted a uniform grey and placed, forest-like, in a near grid. The lights are solar powered and switched on at dusk. (Photo by Joe Klamar/AFP Photo)

Performer Zhang Yashu from a Chinese ballet company perform during a photo shoot in front of the Australia's iconic landmarks Opera House (L) and Habour Bridge in Sydney on February 17, 2014. One of China's celebrated dance campanies is bringing one of the country's biggest ballet production to Australia for a series of performances in Sydney and Melbourne. (Photo by Saeed Khan/AFP Photo)

Opposition supporters stand over a monument of a tank which they dragged into the middle of the street during a protest against Nicolas Maduro's government in San Cristobal, some 410 miles (660 km) southwest of Caracas February 19, 2014. Tensions have risen in Venezuela since Lopez, a 42-year-old Harvard-educated economist, surrendered to troops on Tuesday after spearheading three weeks of often rowdy demonstrations against President Nicolas Maduro's government. (Photo by Carlos Eduardo Ramirez/Reuters)

A firefighter attempts to extinguish a fire which broke out on piles of reed at a paper factory in Changde, Hunan province, on February 16, 2014. (Photo by Reuters/Stringer)

Kumamon gestures to brand officer for the Kumamoto prefecture government, Masataka Naruo (L) during a press conference at the foreign correspondents' club in Tokyo on February 15, 2014. (Photo by Toshifumi Kitamura/AFP Photo)

A dancer performs during carnival in Encarncion, 375 km south of Asuncion on February 15, 2014. (Photo by Norberto Duarte/AFP Photo)

Two boys among thousands of Shembe men, members of the Shembe Church (Nazareth Baptist Church), a traditionalist Zulu church, clad in leopard-skin dance during a ceremony to worship God on January 26, 2014 in Durban. Leopard skins symbolise pride and royalty to the Nazareth Baptist Church, whose members are encouraged to don the costly dress for customary rituals. But as lost habitat and poaching send the cats' numbers plummeting, church leaders have agreed with conservationists to offer a cheaper, kitty-friendly synthetic alternative. “The leopard skin has got a significance, because it shows power”, said church spokesman Lizwi Ncwane, adding that “We also see the importance of the conservation of the cat. For the past four months now, we have been using fake skins, because we are trying to bring awareness among our people”, Ncwane told AFP. The movement, more commonly known as the Shembe Church, was founded by religious leader Isaiah Shembe a century ago and joins Christianity with Zulu customs. (Photo by Alexander Joe/AFP Photo)

An anti-government protester stands near Thai soldiers guarding a Defence Ministry compound, which is serving as a temporary office for Thai Prime Minister Yingluck Shinawatra, in north Bangkok, on February 18, 2014. (Photo by Athit Perawongmetha/Reuters)

Villagers run in sea water as they carry a sedan chair holding their gods during an annual folk performance known as “sea rush” to celebrate the Lantern Festival in Nanri Island of Putian, Fujian province, on February 18, 2014. (Photo by Reuters/Stringer)

Riot police aim at anti-government protesters during clashes in central Kiev on February 18, 2014. (Photo by Anatolii Boiko/AFP Photo)

Models showcase designs by Agatha Ruiz de la Prada on the runway at Agatha Ruiz de la Prada show during Mercedes Benz Fashion Week Madrid Fall/Winter 2014 at Ifema on February 16, 2014 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)

Children watch their classmates pour cold water on themselves under the watch of fitness coach Oksana Kabochko (C) at local kindergarten number 317 during a snowfall in Russia's Siberian city of Krasnoyarsk, on February 20, 2014. (Photo by Ilya Naymushin/Reuters)

Dawoodi Bohra Muslims raise their arms as they take blessings from their new spiritual leader Syedna Mufaddal Saifuddin in Mumbai February 19, 2014. (Photo by Danish Siddiqui/Reuters)

An opposition supporter shouts at a riot police officer during a protest against President Nicolas Maduro's government in Caracas February 17, 2014. Venezuela ordered the expulsion of three U.S. diplomats on Monday on charges of recruiting university students to lead demonstrations that have left three dead in the OPEC nation's most serious violence since President Nicolas Maduro's election in April. (Photo by Carlos Garcia/Reuters)

Protesters carry manipulated portraits of late political figures who were known smokers, (L-R) British Prime Minister Winston Churchill, Chinese leader Mao Zedong, U.S. President Franklin Roosevelt and Chinese leader Deng Xiaoping, against a potential tax increase on cigarettes to be announced during the upcoming annual budget in Hong Kong February 20, 2014. (Photo by Bobby Yip/Reuters)

Ballet dancers take part in a practice session before the South African International Ballet Competition to be held in Cape Town, South Africa, Monday, February 17, 2014. The fourth annual ballet competition takes place between Feb. 17-23. It is the only event of its kind on the African continent and attracts top dancers from all over the world. (Photo by Schalk van Zuydam/AP Photo)

A child reaches up to a model of a hedgehog, measuring 12 feet long, 8 feet wide, and 7 feet tall, on Clapham Common in south London, on February 16, 2014, as it marks the launch of the second series of David Attenborough's Natural Curiosities on UKTV's Watch channel. (Photo by David Parry/PA Wire)

A woman trapped in the rubble of a collapsed resort building waits to be rescued in Gyeongju, South Korea, Monday, February 17, 2014. South Korean police and news reports say that dozens of university students are feared trapped after a building's roof collapsed because of recent heavy snowfall. (Photo by Lee Sang-Hyun/AP Photo/Yonhap)

French troops of the “Operation Sangaris” man a position at a checkpoint in Bangui's PK12 area, Central African Republic, on February 18, 2014. Eight people, including six civilians, have been killed in a firefight between African peacekeepers and fighters from the mainly Christian “anti-balaka” militia, a police source said on February 18. (Photo by Fred Dufour/AFP Photo)

Australia's Katya Crema, from left, Sweden's Sandra Naeslund and Switzerland's Fanny Smith compete during their ski cross race at the 2014 Winter Olympics, Friday, February 21, 2014, in Krasnaya Polyana, Russia. (Photo by Matthias Schrader/AP Photo)

Belarus' winner Anton Kushnir competes during the men's freestyle skiing aerials qualification round at the Sochi 2014 Winter Olympics in Rosa Khutor February 17, 2014. (Photo by Dylan Martinez/Reuters)

Rebel fighters fire a heavy machine gun at the government forces Al-Samman checkpoint on a road leading to Idlib near the Syrian city of Hama, on February 17, 2014. More than 140,000 people have been killed in three years of fighting, according to the Syrian Observatory for Human Rights. (Photo by Abu Hadi Al-Hamwi/AFP Photo)

The mystery of how Cassiopeia A exploded is unraveling thanks to new data from NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR. In this NASA image obtained February 19, 2014, NuSTAR data, which shows high-energy X-rays from radioactive material, are colored blue. Lower-energy X-rays from non-radioactive material, imaged previously with NASA's Chandra X-ray Observatory, are shown in red, yellow and green. The new view shows a more complete picture of Cassiopeia A, the remains of a star that blew up in a supernova event whose light reached Earth about 350 years ago, when it could have appeared to observers as a star that suddenly brightened. The remnant is located 11,000 light-years away from Earth. NuSTAR is the first telescope capable of taking detailed pictures of the radioactive material in the Cassiopeia A supernova remnant. While other telescopes have detected radioactivity in these objects before, NuSTAR is the first capable of pinpointing the location of the radioactivity, creating maps. (Photo by NASA/AFP Photo/PL-Caltech/CXC/SAO)

Riot police fire rubber bullets into the crowds of anti-government protesters during a clash in Bangkok, Thailand, Tuesday, February 18, 2014. Emergency medical officials say that one civilian was killed and 50 people were injured in clashes between Thai police and anti-government protesters in Bangkok. (Photo by Wally Santana/AP Photo)

Rain falls with the New York Stock Exchange in the background as seen through the statue of George Washington at Federal Hall in Manhattan, on February 19, 2014. (Photo by Timothy Clary/AFP Photo)

Pakistani girl, Kiran Riasat, 8, who works with her mother and father, seen in the background, in a brick factory, checks on her brother, Rizwan, 1.5, laying in a hammock attached on a bed, at the site of work, in the outskirts of Islamabad, Pakistan, Tuesday, February 18, 2014. According to Kiran's parents she started to work at the factory 3 years ago, and they couldn't afford financially sending her to a school. (Photo by Muhammed Muheisen/AP Photo)

Police detain people outside Zamoskvoretsky District Court in Moscow, on February 21, 2014. A Russian court has convicted eight people for their role in a 2012 protest against Vladimir Putin that turned violent, following a trial seen as part of the Kremlin's efforts to stifle dissent. Moscow's Zamoskvoretsky District Court delivered its verdict on Friday. Outside the court building, police detained about 50 of a few hundred people who came to support the defendants. (Photo by Denis Tyrin/Associated Press)

An anti-government protester moves past burning car tires as he carries flowers to be laid at the spot where some of his comrades were killed the previous day, at a barricade in central Kiev, Ukraine, Friday, February 21, 2014. European officials say Ukrainian protesters have agreed to a deal with Ukraine's president on defusing a deadly political crisis. Earlier Friday President Viktor Yanukovych announced early elections and promised to invite the opposition into the government. (Photo by Darko Bandic/AP Photo)

Artist Trey Speegle photographs first lady Michelle Obama as she prepares to autograph his color-by-numbers mural featuring the slogan for WAT-AAH!, a line of bottled water targeted to kids and teens, at the New Museum in New York, on February 20, 2014. (Photo by Richard Drew/Associated Press)

Martin Truex Jr. drives his burning car across the grass after a crash during the second of two NASCAR Sprint Cup series qualifying races at Daytona International Speedway, on February 20, 2014. (Photo by Terry Renna/Associated Press)