Mayeli Vasallo (left) and Jorge Monte pump gas in Miami in April. The average price of a gallon of gas has dropped 20 cents in the last month, to $3.73. Joe Raedle/Getty Images hide caption

California's Legislative Analyst's Office said the latest proposal to build a $68.4 billion high-speed train system is still too vague and the state legislature should not approve funding it for it this year. Rich Pedroncelli/AP hide caption

Steve Jobs filed more than 300 patents, now on display at the Smithsonian's S. Dillon Ripley Center in Washington, D.C. Melisa Goh/NPR hide caption

Conservator Angelyn Bass cleans and stabilizes the surface of a wall of a Mayan house that dates to the ninth century. The figure of a man who may have been the town scribe appears on the wall to her left. Tyrone Turner/Copyright 2012 National Geographic hide caption

President Obama speaks during a campaign rally at Ohio State University, Saturday in Columbus, Ohio. Haraz N. Ghanbari/AP hide caption

Democratic Senate candidate Elizabeth Warren holds up a poster of herself as Sen. Scott Brown, R-Mass., looks on during the annual St. Patrick's Day Breakfast in Boston on March 18. A civility pledge between the candidates has kept attack ads largely on the sidelines in their race. Michael Dwyer/AP hide caption

Vladimir Putin, currently prime minister, begins his third term as Russia's president on Monday. Alexander Zemlianichenko/AP hide caption

A mural in Cairo depicts the split faces of Egyptian military ruler Field Marshal Hussein Tantawi, left, and ousted president Hosni Mubarak accompanied by Arabic that reads, "who assigned you did not die, No for gas export to Israel, the revolution continues." Nasser Nasser/AP hide caption

Bedouins watch flames rise in July 2011 after masked gunmen blew up a terminal of the Egyptian natural gas pipeline to Israel and Jordan. It was one of many attacks on the pipeline since the popular uprising that ousted longtime Egyptian leader Hosni Mubarak last year. AP hide caption

The National Guard's 182nd Infantry Regiment returned home in March from a year in Afghanistan. One in three said they were unemployed or looking for work. Becky Lettenberger/NPR hide caption

Kate Musick (left) taught Harlee Patrick in elementary school in Gloucester, Va. StoryCorps hide caption

Argentine President Cristina Fernandez holds up a petroleum sample as she announces plans for her government to nationalize a giant oil company that is largely owned by a private Spanish company. Behind her is an image of the country's former first lady, Eva Peron. Daniel Garcia/AFP/Getty Images hide caption

Undocumented immigrants are searched before boarding a deportation flight in Mesa, Ariz., last June. Since the passage of the state's immigration law two years ago, thousands of illegal workers have left. John Moore/Getty Images hide caption

Simone Wiegele of Germany riding "Arkansas" in action during a 2011 competition in Leipzig, Germany. The sport is becoming more popular in the American northwest, and parents of kids who learn horse vaulting say it helps teach concentration and confidence. Matthew Lewis/Getty Images hide caption

Specialist Tad Donoho screams with pain after being administered a "pink belly" for his birthday: Each member of the platoon struck his stomach until it bruised. July 2008. Tim Hetherington hide caption