ANYmal-D, the badminton-playing quadruped robot from ETH Zurich, combines artificial intelligence with whole-body coordination to rally with human players for up to 10 shots.

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Musk said he expected it to cost "less than a car," adding, "You should be able to buy an Optimus robot for, I think, probably $20,000 to $30,000 long term." In June, Tesla said of the robot, "It ...