HIGHER LEARNING: Children sat in a lecture hall at Martin Luther University in Halle, Germany, Tuesday. The children’s program started with an introduction to mathematics and physics. More than 1,200 children registered and almost all events are fully booked. (Peter Endig/DPA/Zuma Press)

HIGHER LEARNING: Children sat in a lecture hall at Martin Luther University in Halle, Germany, Tuesday. The children’s program started with an introduction to mathematics and physics. More than 1,200 children registered and almost all events are fully booked. (Peter Endig/DPA/Zuma Press)

OM: Participants practiced yoga during Baba Ram Dev’s free yoga camp in Gwalior, India, on Friday. Baba Ramdev touring the country, seeking public support against corruption. More than 10,000 people took part in the yoga camp. (Sanjeev Gupta/EPA)

OM: Participants practiced yoga during Baba Ram Dev’s free yoga camp in Gwalior, India, on Friday. Baba Ramdev touring the country, seeking public support against corruption. More than 10,000 people took part in the yoga camp. (Sanjeev Gupta/EPA)

Workers carried out a radiation screening on a bus set for a media tour at the tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima prefecture, Japan, Saturday.

Workers carried out a radiation screening on a bus set for a media tour at the tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima prefecture, Japan, Saturday.

17/04/12 Discovery is replacing Enterprise at the National Air & Space Museum near Washington DC. Enterprise, the prototype shuttle, is moving on to a New York museum. Marcus Smith took this image as it passed over Vint Hill in Virginia on its approach to Dulles Airport.

17/04/12 Discovery is replacing Enterprise at the National Air & Space Museum near Washington DC. Enterprise, the prototype shuttle, is moving on to a New York museum. Marcus Smith took this image as it passed over Vint Hill in Virginia on its approach to Dulles Airport.

Winner, Professional Current Affairs: Personality and society. Reality vs illusions - In 2012, the people of North Korea celebrated the centennial birthday of the founder of their state, Kim Il Sung. [...] Here, school students and a soldier at an official ceremony unveiling a monument to Kim Il Sung and Kim Jong Il. (© Ilya Pitalev/2013 Sony World Photography Awards)

Winner, Professional Current Affairs: Personality and society. Reality vs illusions - In 2012, the people of North Korea celebrated the centennial birthday of the founder of their state, Kim Il Sung. [...] Here, school students and a soldier at an official ceremony unveiling a monument to Kim Il Sung and Kim Jong Il. (© Ilya Pitalev/2013 Sony World Photography Awards)

Demonstrators wearing masks depicting European leaders simulate playing a soccer match to protest against the euro zone debt crisis, in front of the Chigi palace in Rome, Italy.

Demonstrators wearing masks depicting European leaders simulate playing a soccer match to protest against the euro zone debt crisis, in front of the Chigi palace in Rome, Italy.

John Mark Rozendaal performed on the Wall Street 4/5 subway platform as part of Bach in the Subways Day on Wednesday. (Daniella Zalcman for The Wall Street Journal)

John Mark Rozendaal performed on the Wall Street 4/5 subway platform as part of Bach in the Subways Day on Wednesday. (Daniella Zalcman for The Wall Street Journal)

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