Students from Vida Nueva School present their dinosaur robot built with recycled materials during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A student presents a helicopter built with recycled Coca-Cola cans during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A student from Don Bosco School prepares a robot built with recycled materials during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A dinosaur robot built with recycled materials is pictured during the annual robotics fair supported by Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A dinosaur robot built with recycled materials is pictured during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. The robot cost about $2 to make. (Photo by David Mercado/Reuters)

A dinosaur robot built with recycled materials is pictured during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

Students (L) pose with their relatives as they present dinosaur robots built with recycled materials during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A student jokes with a dinosaur robot built with recycled materials during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

A student is helped by his teacher to build a dinosaur robot during the annual robotics fair supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)

Robots built with recycled materials are seen during the annual robotics fair for students supported by the Bolivian Education Ministry in La Paz, August 10, 2015. (Photo by David Mercado/Reuters)