A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai TPX IMAGES OF THE DAY 

Members of the media film a basketball-playing robot called CUE, developed by Toyota engineers, during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, is seen during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

An engineer sets a ball to a basketball-playing robot called CUE, developed by Toyota engineers, to shoot a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

A basketball-playing robot called CUE, developed by Toyota engineers, shoots a free throw during a rehearsal for half-time show of Alvark Tokyo's basketball match in Tokyo, Japan March 28, 2018. REUTERS/Toru Hanai 

An aerial view shows the brine pools of SQM lithium mine on the Atacama salt flat in the Atacama desert of northern Chile, January 10, 2013. Picture taken January 10, 2013. REUTERS/Ivan Alvarado 

An aerial view shows the brine pools of SQM lithium mine on the Atacama salt flat in the Atacama desert of northern Chile, January 10, 2013. Picture taken January 10, 2013. REUTERS/Ivan Alvarado 

The children's section of Trafalgar swimming pool lies empty in Cape Town, South Africa, February 9, 2018. The city has closed many of its public swimming pools and has imposed severe water restrictions in an attempt to avert a major water crisis. REUTERS/Mike Hutchings SEARCH "HUTCHINGS ZERO" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Newlands swimming pool lies empty in Cape Town, South Africa, February 9, 2018. The city has closed many of its public swimming pools and has imposed severe water restrictions in an attempt to avert a major water crisis. REUTERS/Mike Hutchings SEARCH "HUTCHINGS ZERO" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Student practices at World Snooker College in Beijing, China, April 29, 2017. REUTERS/Iris Zhao 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Andrew Boyers Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two (L) wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Action Images via Reuters / Jason Cairnduff Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Reuters / Phil Noble Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Grand National Festival - Aintree Racecourse - 6/4/17 Lizzie Kelly on Tea For Two wins the 2.50 Betway Bowl Chase ahead of Paddy Brennan on Cue Card Reuters / Phil Noble Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Colin Tizzard Stable Visit - Cheltenham Festival Preview - Spurles Farm, Milborne Port, Dorset - 23/2/17 Trainer Colin Tizzard with with Native River (L) and Cue Card (R) during the stable visit Action Images via Reuters / Matthew Childs Livepic EDITORIAL USE ONLY. 

Britain Horse Racing - Colin Tizzard Stable Visit - Cheltenham Festival Preview - Spurles Farm, Milborne Port, Dorset - 23/2/17 Trainer Colin Tizzard with Cue Card during the stable visit Action Images via Reuters / Matthew Childs Livepic EDITORIAL USE ONLY. 

Actors Kathleen Munroe (L), Anupam Kher, Gerard Butler (C), and Maxwell Jenkins (R), pose with director Mark Williams (2nd R), as they arrive on the red carpet for the film "The Headhunter’s Calling" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 14, 2016. REUTERS/Mark Blinch

Children play billiard in Abu Shock IDPs camp in Al Fashir, capital of North Darfur, Sudan, September 6, 2016. REUTERS/Mohamed Nureldin Abdallah 

A boy places billiard balls on a table to form a triangle in Abu Shock IDPs camp in Al Fashir, capital of North Darfur, Sudan, September 6, 2016. REUTERS/Mohamed Nureldin Abdallah 

Children play billiard in Abu Shock IDPs camp in Al Fashir, capital of North Darfur, Sudan, September 6, 2016. REUTERS/Mohamed Nureldin Abdallah 

2016 Rio Olympics - Equestrian - Final - Jumping Team Finals - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 17/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Final - Jumping Team Finals - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 17/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa competes. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa competes. REUTERS/Tony Gentile TPX IMAGES OF THE DAY FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa competes. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 16/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa competes. REUTERS/Tony Gentile TPX IMAGES OF THE DAY FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 14/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 14/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Team Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 14/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

2016 Rio Olympics - Equestrian - Preliminary - Jumping Individual Qualification - Olympic Equestrian Centre - Rio de Janeiro, Brazil - 14/08/2016. Malin Baryard-Johnsson (SWE) of Sweden riding Cue Channa jumps. REUTERS/Tony Gentile FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
Picture Supplied by Action Images 

Snooker player Ronnie O'Sullivan poses with his partner Laila Rouass after receiving an OBE from the Prince of Wales at an investiture ceremony at Buckingham Palace in London, Britain May 6, 2016. REUTERS/John Stillwell/Pool

Snooker player Ronnie O'Sullivan poses after receiving an OBE from the Prince of Wales at an investiture ceremony at Buckingham Palace in London, Britain May 6, 2016. REUTERS/John Stillwell/Pool

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan (2nd L) on his way to winning the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan (2nd L) on his way to winning the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan (4th L) on his way to winning the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan wins the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan clears the last to win the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
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Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan wins the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan wins the 2.50 Betfred Bowl Steeple Chase
Action Images via Reuters / Jason Cairnduff
Livepic
EDITORIAL USE ONLY. 

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan clears the last to win the 2.50 Betfred Bowl Steeple Chase
Reuters / Andrew Yates
Livepic
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Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan clears the last to win the 2.50 Betfred Bowl Steeple Chase
Reuters / Andrew Yates
Livepic
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Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 7/4/16
Cue Card ridden by Paddy Brennan clears the last to win the 2.50 Betfred Bowl Steeple Chase
Reuters / Andrew Yates
Livepic
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A voter looks over her ballot during voting in Illinois' U.S. presidential primary election at Marie's Golden Cue pool hall in Chicago, Illinois, United States, March 15, 2016. REUTERS/Jim Young