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Photo: Hitachi's rolling robots

Wheels rather than feet help Pal and Chum scoot around as they train for work in offices and factories.

Hitachi's rolling robots

Hitachi's new "Emiew" robots, Pal and Chum, use wheels instead of feet to move at a spritely 3.7 mph. The rolling robots have a vocabulary of about 100 words and are intended for eventual use in offices and factories.

Credit: Toshifumi Kitamura/AFP/Getty Images

Emiew robots