The humanoid robot Pepper, developed by SoftBank Corp.’s Aldebaran Robotics unit, stands in the SoftBank Robotics headquarters in Tokyo, Japan, on Monday, Sept. 1, 2014. Billionaire Masayoshi Son will start selling his humanoid robots at Sprint Corp. stores in the U.S. by next summer, part of SoftBank Corp.s push to take the technology beyond factory floors. Photographer: Akio Kon/Bloomberg via Getty Images