A humanoid robot named "Yangyang" shows a facial expression during a demonstration in Beijing, China, April 29, 2015. REUTERS/Kim Kyung-Hoon 

Andoroid Repliee Q2 (L) faces graduate student Motoko Noma at an exhibition during Core Technology Symposium in Tokyo October 31, 2006. Repliee Q2, with 42 actuators to generate humanlike behaviour, has been developed by the Department of Adaptive Machine Systems Graduate School of Engineering of Osaka University. REUTERS/Kiyoshi Ota (JAPAN) 

A reception employee of Nihonbashi Mitsukoshi department store (R) poses for a photo with a kimono-clad android robot named Aiko Chihira, developed by Toshiba Corp., during its unveiling at the reception desk of the store in Tokyo April 20, 2015. The humanoid robot, originally introduced by Toshiba last year, which can use sign language and introduce itself, started work at the department store reception desk in downtown Tokyo on Monday. It is designed to interact with customers and recently has been upgraded to speak Chinese, a department store offical said. REUTERS/Issei Kato TPX IMAGES OF THE DAY

Toshiba Corp. demonstrates its communications android named Ms. Aiko Chihira that can use sign language and introduce itself, at the Combined Exhibition of Advanced Technologies (CEATEC) JAPAN 2014 in Chiba, east of Tokyo, October 7, 2014. Over 500 companies and organisations are exhibiting at CEATEC JAPAN 2014, which will be held until October 11, 2014. REUTERS/Issei Kato (JAPAN - Tags: SCIENCE TECHNOLOGY SOCIETY BUSINESS TPX IMAGES OF THE DAY) 

A humanoid robot named Han developed by Hanson Robotics reacts as the controller commands it via a mobile phone to make a facial expression during the Global Sources spring electronics show in Hong Kong April 18, 2015. According to Hanson Robotics the robot's skin is made out of a material called Frubber, an elastic polymer that mimics the human skin, and installed with about 40 motors on its face which help create various expressions. Han can answer simple questions and staff said it can be used in the field of customer service. The show ends on April 21. REUTERS/Tyrone Siu 

A man looks at the HRP-4C Miim humanoid robot at the venue of the Annual Meetings of the International Monetary Fund and the World Bank Group in Tokyo October 9, 2012. Global growth in advanced economies is too weak to bring down unemployment and what little momentum exists is coming primarily from central banks, the International Monetary Fund said in its World Economic Outlook, released ahead of its twice-yearly meeting, which will be held in Tokyo later this week. REUTERS/Toru Hanai (JAPAN - Tags: POLITICS BUSINESS) 

An engineer makes an adjustment to the robot "The Incredible Bionic Man" at the Smithsonian National Air and Space Museum in Washington October 17, 2013. The robot is the world's first-ever functioning bionic man made of prosthetic parts and artificial organ implants. REUTERS/Joshua Roberts (UNITED STATES - Tags: SOCIETY SCIENCE TECHNOLOGY) FOR BEST QUALITY IMAGE SEE GF2EA4P0CW301 

A humanoid robot named "Saya" (R) is touched by school pupils as she takes on a role as a school teacher during a demonstration at an elementary school in Tokyo May 7, 2009. The robot, developed by Tokyo University of Science professor Hiroshi Kobayashi, can speak different languages and make facial expressions like happiness, surprise, sadness, fear, anger or disgust with motors inside her face. REUTERS/Issei Kato (JAPAN EDUCATION SOCIETY SCI TECH IMAGES OF THE DAY) 

The HRP-4C humanoid robot "Miim" presents a wedding dress by Japanese designer Yumi Katsura during the 2009 Yumi Katsura Paris Grand Collection in Osaka, western Japan, July 22, 2009. REUTERS/Toru Hanai (JAPAN ENTERTAINMENT SOCIETY SCI TECH) 

RNPS IMAGES OF THE YEAR 2007 - A humanoid robot named Kansei, meaning "sensibility" in Japanese, makes a facial expression depicting "fear", next to the word "Bomb" during a demonstration at a laboratory of Meiji University's Robot and Science Institute in Kawasaki, south of Tokyo June 4, 2007. The robot, developed by professor Junichi Takeno and a team of researchers, is able to make up to 36 kinds of facial expressions after typing a word to its software which extracts word associations from a data base of 500,000 words and calculates the level ranging between pleasantness to unpleasantness which prompts the robot to make facial expressions accordingly. REUTERS/Yuriko Nakao (JAPAN) 

Danish scientist Henrik Scharfe (R) poses with his Geminoid-DK robot during its presentation at the National Robotics Olympiad in San Jose August 16, 2013. The Geminoid-DK is a tele-operated Android in the geminoid series and is made to appear as an exact copy of its creator, Professor Scharfe. REUTERS/Juan Carlos Ulate (COSTA RICA - Tags: SCIENCE TECHNOLOGY) 

Visitors watch a robot plays a clarinet at the China International Industry Fair 2006 in Shanghai November 2, 2006. REUTERS/Nir Elias (CHINA) 

A dentist demonstrates on a dental patient robot at Showa University in Tokyo, Japan March 25, 2010. The humanoid female robot was developed to give practical experience for dental students and can be used for examination purposes. The robot displays autonomous action of physiological phenomenon such as eye and tongue movement and can be controlled by either original programming or an instructor using an external touch panel, the university said. REUTERS/Kim Kyung-Hoon