Brett Throckmorten of Barnes Bullets shows Logan Wingo how to sight down an electronic rifle in the trade booth area during the National Rifle Association's annual meeting in Nashville, Tennessee, April 11, 2015. (Photo by Harrison McClary/Reuters)

A protester jumps on the table in front of the European Central Bank President Mario Draghi during a news conference in Frankfurt, April 15, 2015. The news conference was disrupted on Wednesday when a woman in a black T-shirt jumped on the podium. (Photo by Kai Pfaffenbach/Reuters)

A man feeds a seagull during a record low tide in Saint Malo, western France, March 21, 2015. Towns on France's North Atlantic coast braced for their first giant tide of the millennium on Saturday as the full moon and this week's solar eclipse combined to create an ocean surge not seen since 1997. (Photo by Stephane Mahe/Reuters)

Tibetan monks dressed as demons attend the Beating Ghost festival at the Yonghe Temple, also known as the Lama Temple, in Beijing on March 19, 2015. The Beating Ghost festival, or Da Gui festival in Chinese, is an important ritual of Tibetan Buddhism and is believed to expel evil spirits and shake off troubles. (Photo by Wang Zhao/AFP Photo)

Israeli illusionist and endurance artist Hezi Dean performs a purported levitation trick in Tel Aviv March 22, 2015. Dean on Sunday began what he calls a “24-hour levitation” on the outside of a Tel Aviv building. (Photo by Baz Ratner/Reuters)

Two F-15E Strike Eagles wait to receive fuel from a KC-135R Stratotanker during exercise Red Flag 15-1 on their way to Nellis Air Force Base, Nev., Jauary 23, 2015. The F-15s are assigned to the 4th Fighter Wing. U.S. (Photo by Airman 1st Class Aaron J. Jenne/Reuters)

Two men help each other cross a street covered in deep mud in Copiapo, Chile, Thursday, March 26, 2015. Unusually heavy thunder storms and torrential rains that began on Tuesday have blocked roads, caused power outages and affected some 600 people on this normally dry region. (Photo by Aton Chile/Marcelo Hernandez/AP Photo)

Ultra-Orthodox Jews knead dough in a bakery in an Orthodox neighborhood in Jerusalem, 29 March 2015. Matzah, or unleavened bread, is used instead of bread during the week-long Jewish holiday of Passover, commemorating the Jewish exodus from Egypt in Biblical times. (Photo by Abir Sultan/EPA)