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
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
Voice of America was criticized after the veracity of its interview with a Russian anti-corruption activist was questioned. In this photo provided by the network, a control room is seen during a Russian-language Web show.
Voice of America
The University of California Pavement Research Center in Davis works on creating longer lasting, quieter and more fuel-efficient pavement. Above, samples of asphalt being tested at the center.