Tuesday

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Charles Wiwa fled Nigeria in 1996 following a crackdown on protests against Shell's oil operations in the Niger Delta. Now a resident of Chicago, Wiwa and other natives of the oil-rich Ogoni region are suing Shell for human rights violations. Charles Rex Arbogast/AP hide caption

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Monday

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Traumatic brain injuries are most often caused by powerful blasts from improvised explosive devices. A roadside bomb explodes, and the concussive effect violently shakes the brain inside the skull. Stefano Rellandini/Reuters /Landov hide caption

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Alexei Venediktov, then editor-in-chief of Moscow Echo radio station, talks with Russian Prime Minister Vladimir Putin during an awards ceremony in Moscow, Jan. 13. Venediktov's ouster this month is seen as a sign that the Russian government may be cracking down on the independent media. Yana Lapikova/AFP/Getty Images hide caption

toggle caption Yana Lapikova/AFP/Getty Images
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