A rescued manatee suffering from exposure to an algae bloom called red tide in southwest Florida comes up for air as it swims into a critical care tank at Tampa's Lowry Park Zoo.
Thousands of "fairy circles" dot the landscape of the NamibRand Nature Reserve in Namibia. Why these barren circles appear in grassland areas has puzzled scientists for years.
Chief Almir of Brazil's Surui tribe attends a press conference with Google representatives in Rio de Janeiro last year. Chief Almir has brought technology to his previously isolated people, who now use smartphones to send photos of illegal logging in the Amazon.
Vanderlei Almeida /AFP/Getty Images