A humanoid robot, jointly developed by University of Tokyo and Japan's public research organization Advanced Industrial Science and Technology, lifts up a basket filled with coral sand weighing around 30 kg (66 pounds) during a demonstration in Tokyo April 24, 2007. The robot, aimed to be used in fields such as nursing care and housework, is the world's first humanoid robot which is capable of lifting up a box weighing 30 kg (66 pounds) and dragging a mannequin weighing 66 kg (145 pounds) controlled by its built-in sensors, Tokyo University's professor Yasuo Kuniyoshi said. REUTERS/Yuriko Nakao(JAPAN) 

Visitors look at a kimono-clad android robot (L) named Aiko Chihira, developed by Toshiba Corp., at the reception desk of Nihonbashi Mitsukoshi department store in Tokyo April 20, 2015. The human shaped robot, originally introduced by Toshiba last year can use sign language and introduce itself, started to work at the reception desk in the department store in downtown Tokyo on Monday. It is designed to interact with customers and recently has been upgraded so it can speak in Chinese, the department offical said. REUTERS/Issei Kato 

Humanoid robot bartender "Carl" gestures to guests at the Robots Bar and Lounge in the eastern German town of Ilmenau, July 26, 2013. "Carl", developed and built by mechatronics engineer Ben Schaefer who runs a company for humanoid robots, prepares spirits for the mixing of cocktails and is able to interact with customers in small conversations. Picture taken July 26, 2013. REUTERS/Fabrizio Bensch (GERMANY - Tags: SOCIETY SCIENCE TECHNOLOGY BUSINESS) 

A robot named "Robovie-II" moves around a grocery store in Kyoto January 6, 2010. "Robovie-II" is part of an experiment developed by Japanese robotics research institution ATR, to help the elderly with chores. The robot greets the shopper at the entrance of the store, follows him to the shelves while holding a grocery basket and reminds him of the items on a shopping list, which the shopper would have entered beforehand in a specialized mobile device. REUTERS/Yuriko Nakao (JAPAN - Tags: SOCIETY SCI TECH) 

A robot in the Robotic Kitchen prototype created by Moley Robotics cooks a crab soup at the company's booth at the world's largest industrial technology fair, the Hannover Messe, in Hanover April 13, 2015. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY 

Robots deliver dishes to customers at a Robot Restaurant in Harbin, Heilongjiang province January 12, 2013. Opened in June 2012, the restaurant has gained fame in using a total of 20 robots, which range in heights of 1.3-1.6 metres (4.27-5.25 ft), to cook meals and deliver dishes. The robots can work continuously for five hours after a two-hour charge, and are able to display over 10 expressions on their faces and say basic welcoming sentences to customers, local media reported. REUTERS/Sheng Li (CHINA - Tags: SOCIETY SCIENCE TECHNOLOGY FOOD) 

Humanoid robot HRP-2 uses a tap after washing a cup during a demonstration at Tokyo University February 28, 2007. Tokyo University's researchers showcased on Wednesday humanoid robots which can perform household chores such as serving tea and washing dishes. REUTERS/Kim Kyung-Hoon (JAPAN) 

Honda's latest version of the Asimo humanoid robot pours a drink into a cup during a presentation in Zaventem near Brussels July 16, 2014. Honda introduced in Belgium an improved version of its Asimo humanoid robot that it says has enhanced intelligence and hand dexterity, and is able to run at a speed of some 9 kilometres per hour (5.6 miles per hour). REUTERS/Francois Lenoir (BELGIUM - Tags: SCIENCE TECHNOLOGY BUSINESS SOCIETY) 

SoftBank Corp's human-like robot named "Pepper" gestures as it introduces Nestle's coffee machines at an electric shop in Tokyo December 1, 2014. Nestle SA started to use robots to help sell its coffee makers at electronics stores across Japan, becoming the first corporate customer for the chatty, bug-eyed androids unveiled in June by tech conglomerate SoftBank Corp. The waist-high robot, developed by a French company and manufactured in Taiwan, was touted by Japan's SoftBank as capable of learning and expressing human emotions, and of serving as a companion or guide in a country that faces chronic labour shortages. The maker of Nescafe coffee and KitKat chocolate bars plans to have the robots working at 1,000 stores by the end of next year, a Nestle official said. REUTERS/Issei Kato (JAPAN - Tags: SCIENCE TECHNOLOGY SOCIETY BUSINESS TPX IMAGES OF THE DAY) 

A humanoid robot named "I-Fairy" (C) acts as a witness at the wedding ceremony between Tomohiro Shibata (L) and Satoko Inoue in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. REUTERS/Yuriko Nakao (JAPAN - Tags: SCI TECH ODDLY SOCIETY) 

Farmer Wu Yulu drives his rickshaw pulled by a his home-made walking robot near his home in a village at the outskirts of Beijing January 8, 2009. This robot is the latest and largest development of hobby inventor Wu, who started to build robots in 1986, made of wire, metal, screws and nails found in rubbish sites. REUTERS/Reinhard Krause (CHINA)