A handout picture taken and released by on May 12, 2016 by Solar Impulse 2 shows Swiss pilot Bertrand Piccard waving as he boards the experimental solar-powered aircraft Solar Impulse 2 prior to taking off from Phoenix, Arizona, en route to Oklahoma, for the latest stage of its around-the-world flight aimed at drawing attention to clean energy technologies. The Solar Impulse 2 plane took off from Phoenix, Arizona en route to Oklahoma on May 12, resuming its record-breaking quest to circle the globe without consuming a drop of fuel. The flight to the city of Tulsa is expected to take about 18 hours. / AFP PHOTO / Solar Impulse 2 / CHRISTOPHE CHAMMARTIN / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / SOLAR IMPULSE 2 / CHRISTOPHE CHAMMARTIN" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS CHRISTOPHE CHAMMARTIN/AFP/Getty Images

A Pakistani young competitor Ghayyur Khan, 12, (R) tries to solve a Rubik's Cube as Hunor Bozsing, three times Rubik's Cube Hungarian national champion, looks on during a competition organised by the Hungarian embassy at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

Pakistani students try to solve Rubik's Cubes during a competition organised by the Hungarian embassy with their three times Rubik's Cube Hungarian national champion, Hunor Bozsing, at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

Hunor Bozsing, three times Rubik's Cube Hungarian national champion, demonstrates solving a Rubik's Cube in front of Pakistani students at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

Pakistani students try to solve Rubik's Cubes during a competition organised by the Hungarian embassy with their three times Rubik's Cube Hungarian national champion, Hunor Bozsing, at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

Hunor Bozsing, three times Rubik's Cube Hungarian national champion, demonstrates solving a Rubik's Cube in front of Pakistani students at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

Hunor Bozsing, three times Rubik's Cube Hungarian national champion, demonstrates solving a Rubik's Cube in front of Pakistani students at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images

A Pakistani competitor tries to solve Rubik cube puzzle as Hunor Bozsing, three times Rubik's Cube Hungarian national champion, looks on during a competition organised by the Hungarian embassy at the National University of Sciences and Technology (NUST) in Islamabad on May 12, 2016. Hunor Bozsing says he got lucky eight years ago: searching for an old toy in his house in Budapest, he instead stumbled across a Rubik's Cube -- a twist of fate which launched him to international fame. Bozsing -- Hungary's three-time national Rubik's Cube champion, who holds six national records -- was in Pakistan on May 12 to organise the country's first Cube competition. / AFP PHOTO / AAMIR QURESHIAAMIR QURESHI/AFP/Getty Images