100 mini robots break dance in Tokyo

One hundred humanoid robots performed a synchronized dance routine in Tokyo on Monday. Each 'Robi' robot weighs just one kilogram (2.2 pounds) and stands 35 centimeters (1.1 foot) tall.

The '100 Robi' project was the brain child of Tomotaka Takahashi of Tokyo University. According to Takahashi, the challenge of the project was to design a robot that could be produced in large numbers at a low cost. Each 'Robi' robot costs around US$1,500.