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Posted: 5/22/2013 2:29:12 PM EST
College students and supporters hold up signs at a rally to support fossil fuel divestment outside of City Hall in San Francisco, Thursday, May 2, 2013. In an effort to slow the pace of climate change, students at more than 200 colleges are asking their schools to stop investing in fossil fuel companies. (AP Photo/Jeff Chiu)
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Posted: 5/22/2013 2:29:12 PM EST
Bill McKibben, founder of 350.org, right, speaks to a crowd of college students and supporters at a rally to support fossil fuel divestment outside of City Hall in San Francisco, Thursday, May 2, 2013. Hayden Higgins, left, rides a Rock The Bike "One Bike/One Speaker," a bicycle that generated power for the sound system at the rally. (AP Photo/Jeff Chiu)
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Posted: 5/22/2013 1:26:35 PM EST
First lady Michelle Obama gives a thumbs up to students from Willow Springs Elementary School in Fairfax, Va., after they performed part of a play at the Decatur House, a National Trust for Historic Preservation Site and home to the David M. Rubenstein National Center for White House History, in Washington, Wednesday, May 22, 2013. The events were part of an announcement of a major philanthropic effort to preserve the Decatur House. Sixth-grader Aidean LeBlanc, who plays President Abraham Lincoln, sits at right. (AP Photo/Susan Walsh)
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Posted: 5/22/2013 11:26:59 AM EST
This May 17, 2013 photo released by Simone Smalls PR shows Olympic gold medalist Cullen Jones give swimming lessons to students at Harlem's P.S. 125 in New York. Jones is ambassador for the 5th Annual USA Swimming Foundation's "Make a Splash Tour," providing free swimming lessons, water safety education and awareness at city pools. (AP Photo/Simone Smalls PR)
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Posted: 5/22/2013 11:26:59 AM EST
This May 17, 2013 photo shows Olympic gold medalist swimmer Cullen Jones posing poolside after giving swimming lesson's to students at Harlem's P.S. 125 in New York. Jones is ambassador for the 5th Annual USA Swimming Foundation's "Make a Splash Tour," a program to provide free swimming lessons, water safety education and awareness at city pools. (AP Photo/Bebeto Matthews)
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Posted: 5/22/2013 11:26:59 AM EST
This May 17, 2013 photo shows Olympic gold medalist swimmer Cullen Jones posing poolside after giving swimming lesson's to students at Harlem's P.S. 125 in New York. Jones is ambassador for the 5th Annual USA Swimming Foundation's "Make a Splash Tour," a program to provide free swimming lessons, water safety education and awareness at city pools. (AP Photo/Bebeto Matthews)
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Posted: 5/21/2013 4:26:06 AM EST
Shawna Scott, second from left, tries to help Jeanett McAllister, second from right, and McAllister's son, Tonice Woods, find McAllister's two nieces, Sabrina and Olivia Durkey, who are students at Briarwood Elementary, after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. At left is Feliciana Hernando, Scott's niece. Scott has a home daycare near SW 156th and Vicki and went to Briarwood to pick up one of the children she watches. She took a group of students from the destroyed school to her home to wait for their parents. (AP Photo/ The Oklahoman, Nate Billings)
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Posted: 5/21/2013 3:49:58 AM EST
Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. (AP Photo Sue Ogrocki)
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Posted: 5/20/2013 10:34:49 PM EST
Irish Prime Minister Enda Kenny waves to students from the dais at Boston College where he received an honorary Doctor of Laws degree during commencement ceremonies at Alumni Stadium in Boston, Monday, May 20, 2013. Cardinal Sean O'Malley skipped Boston College's commencement Monday because of the involvement of Kenny, who supports a bill in his country that would allow abortion. The leader of the Boston Archdiocese traditionally gives the benediction at the college's ceremony. (AP Photo/Elise Amendola)
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Posted: 5/20/2013 9:50:29 PM EST
CORRECTS TORNADO MEASUREMENT TO NUMBER REPORTED BY THE NATIONAL WEATHER SERVICE - Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)
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Posted: 5/20/2013 8:54:32 PM EST
Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Sue Ogrocki)
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Posted: 5/20/2013 4:18:27 AM EST
Residences pray with burning incense sticks in front of a memorial holding skulls of the Khmer Rouge victims at Choeung Ek "Killing Field" in Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual "Day of Anger" events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
A Cambodian woman prays with burning incense sticks in front of a memorial holding skulls of the Khmer Rouge victims at Choeung Ek "Killing Field" in Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual "Day of Anger" events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
A Cambodian woman and her son tour a memorial holding skulls of the Khmer Rouge victims at Choeung Ek "Killing Field" in Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual "Day of Anger" events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
Hundreds of former Khmer Rouge victims' bone and skulls are displayed in a memorial at Choeung Ek "Killing Field" in Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual Day of Anger events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
Cambodian students re-enact torture executed by the Khmer Rouge during their reign of terror in the 1970s to mark the annual "Day of Anger" at Choeung Ek, a former Khmer Rouge "killing field" dotted with mass graves, Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual 'Day of Anger' event to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
Cambodian students re-enact torture executed by the Khmer Rouge during their reign of terror in the 1970s to mark the annual "Day of Anger" at Choeung Ek, a former Khmer Rouge "Killing Field" dotted with mass graves, Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual "Day of Anger" events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/20/2013 4:18:27 AM EST
A Cambodian woman stands with burning incense sticks as she visits a memorial holding skulls of the Khmer Rouge victims at Choeung Ek "Killing Field" in Phnom Penh, Cambodia, Monday, May 20, 2013. Cambodian Buddhist monks, nuns, civil servants, students attend the annual "Day of Anger" events to remember the atrocities and killings committed under the Khmer Rouge's 1975-79 rule. (AP Photo/Heng Sinith)
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Posted: 5/19/2013 7:30:54 PM EST
Graduating students listen to Apple co-founder Steve Wozniak deliver a commencement speech at the University of California at Berkeley on Saturday, May 18, 2013 in Berkeley, Calif. (AP Photo/Tony Avelar)
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Posted: 5/19/2013 7:30:54 PM EST
University of Minnesota, Rochester students toast one another before their graduation ceremony at Mayo Civic Center, Saturday, May 18, 2013, in Rochester, Minn. (AP Photo/The Star Tribune, David Joles) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT.
