As they inspected an underground storage pool near the crippled Fukushima Daiichi nuclear power plant earlier this month, Tokyo Electric Power Co. President Naomi Hirose (4th from left) and other officials wore protective suits and masks. Radioactive water stored in some of the pits has leaked. Tokyo Electric Power Co./Reuters /Landov hide caption

itoggle caption Tokyo Electric Power Co./Reuters /Landov

The research of British naturalist Alfred Russel Wallace (1823-1913) played a pivotal role in developing the theory of natural selection. But over time, Charles Darwin became almost universally thought of as the father of evolution. Hulton-Deutsch Collection/Corbis hide caption

itoggle caption Hulton-Deutsch Collection/Corbis

Pro-democracy supporters in Hong Kong sing and shout slogans during a January protest. Chinese leaders and the state-run media are now speaking often of the Chinese dream, though there's no real consensus on what it means. Philippe Lopez/AFP/Getty Images hide caption

itoggle caption Philippe Lopez/AFP/Getty Images

A woman in downtown Beijing walks past a building adorned with a patriotic mural by Chinese graffiti artists on April 22. Stephen Shaver/UPI/Landov hide caption

itoggle caption Stephen Shaver/UPI/Landov

On Mount Everest, a fistfight allegedly broke out near Camp Three, between climbers and Sherpas. This file photo shows the view from Camp Three at 24,000 feet on the mountain's Lhotse Face. Courtesy of Alan Arnette/AP hide caption

itoggle caption Courtesy of Alan Arnette/AP

Bangladeshi rescue workers take a break Friday on the rubble of a building that collapsed Wednesday in Savar, near Dhaka, Bangladesh. By Friday, the death toll reached 300 as rescuers continued to search for injured and missing. Kevin Frayer/AP hide caption

itoggle caption Kevin Frayer/AP

Japanese Prime Minister Shinzo Abe delivers a speech Sunday in Tokyo as Emperor Akihito, third from right, and Empress Michiko, second from right, listen during a ceremony marking the day Japan recovered its sovereignty under the San Francisco Peace treaty in 1952. Itsuo Inouye/AP hide caption

itoggle caption Itsuo Inouye/AP

Sohel Rana, the fugitive owner of an illegally constructed building that collapsed last week in Bangladesh, killing some 377 people, is paraded by Rapid Action Battalion commandoes for the media in Dhaka, Bangladesh, on Sunday. Palash Khan/AP hide caption

itoggle caption Palash Khan/AP