Palestinian boys compete in the first international Palestinian championship for solving the Rubik's cube, in Ramallah in the Israeli-occupied West Bank July 7, 2019. Picture taken July 7, 2019. REUTERS/Mohamad Torokman

A Palestinian boy exercises before he competes in the first international Palestinian championship for solving the Rubik's cube, in Ramallah in the Israeli-occupied West Bank, July 7, 2019. Picture taken July 7, 2019. REUTERS/Mohamad Torokman

Palestinian youth competes in the first international Palestinian championship for solving the Rubik's cube, in Ramallah, in the Israeli-occupied West Bank, July 7, 2019. Picture taken July 7, 2019. REUTERS/Mohamad Torokman

Guinness World record holder for solving a Rubik's cube with his feet Daniel Rose-Levine practices on solving it in New York, U.S., March 11, 2019. REUTERS/Shannon Stapleton

Guinness World record holder for solving a Rubik's cube with his feet Daniel Rose-Levine practices on solving it in New York, U.S., March 11, 2019. REUTERS/Shannon Stapleton

Guinness World record holder for solving a Rubik's cube with his feet Daniel Rose-Levine practices on solving it in New York, U.S., March 11, 2019. REUTERS/Shannon Stapleton

Guinness World record holder for solving a Rubik's cube with his feet Daniel Rose-Levine practices on solving it in New York, U.S., March 11, 2019. REUTERS/Shannon Stapleton

Erno Rubik, the creator of the puzzle, solves a Rubik's cube as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, solves a Rubik's cube as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, holds a Rubik's cube as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

A competitor solves a Rubik's cubes as he prepares for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Rubik's cubes are pictured during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Eiffel Cube Towers are displayed for sale during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Visitors and competitors walk Rubik's cubes assembled to form a display during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes as they prepare for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes as they prepare for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes as they prepare for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

A competitor solves a Rubik's cube as he prepares for the world's largest Rubiks Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

A competitor solves a Rubik's cube as he prepares for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

A competitor solves a Rubik's cube during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes as they prepare for the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, holds a Rubik's cube as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of Rubik's cube, poses during the world's largest Rubiks Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Erno Rubik, the creator of the puzzle, throws a Rubik's cube in the air as he poses during the world's largest Rubik's Cube championship in Aubervilliers, near Paris, France, July 15, 2017. REUTERS/Stephane Mahe

Competitors solve Rubik's cubes using their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes using their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors concentrate before solving Rubik's cubes during the Rubik's Cube European Championship in Prague, Czech Republic, July 17, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube using his feet as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes as they prepare for the Rubik's Cube European Championship in Prague, Czech Republic, July 17, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes as they prepare for the Rubik's Cube European Championship in Prague, Czech Republic, July 17, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube using one hand during the Rubik's Cube European Championship in Prague, Czech Republic, July 17, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes as they prepare for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors prepare to solve Rubik's cubes with their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes as they prepare for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes using their feet as they prepare for the European Rubik's Cube Championship in Prague, Czech Republic, July 15, 2016. Picture taken July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes using their feet as they prepare for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes using their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

Competitors prepare to solve Rubik's cubes with their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

Competitors solve Rubik's cubes using their feet during the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube using his feet as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

A competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny

A blindfolded competitor solves a Rubik's cube as he prepares for the Rubik's Cube European Championship in Prague, Czech Republic, July 15, 2016. REUTERS/David W Cerny