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Creative Commons photo by Jiuguang-Wang

Scientists have been experimenting with four-legged robots for years. They want robots to carry heavy loads over difficult areas of land and do other difficult jobs.

But one problem is power. Now that has changed. Engineers at the Massachusetts Institute of Technology (MIT) have designed a robot powered by batteries.

And the robot can run. In fact, scientists say their robots will soon be able to run like cheetahs, the fastest...