1st Lt. Fred Simpson considers a computerized mental exercise designed to improve focus and memory. Simpson was knocked unconscious by a grenade blast in Afghanistan and now receives treatment at Walter Reed Army Medical Center in Washington.
An Egyptian soldier (top) keeps watch on the Egyptian side of the Rafah border crossing as Hamas policemen stand guard on the Palestinian side. Egypt announced on April 29 that it would permanently open the Rafah crossing into the Gaza Strip.
Said Khatib/AFP/Getty Images
A worker checks the status of the water level at the Unit 1 reactor at the Fukushima Dai-ichi nuclear power plant in Japan on Tuesday. Japanese officials said the reactor doesn't appear to be holding water, which means its core probably sustained more damage than originally thought.
The Japan Animal Rescue shelter in Samukawa houses about 200 dogs and cats, most of them brought in from the now off-limits area around the Fukushima Dai-ichi nuclear power plant.