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It has been replaced by a new model, which will be used in automotive manufacturing. A farewell video featured the old machine running outdoors, performing back flips and awkwardly shimmying.

Carnegie Mellon University students built Iris, a tiny lunar rover. When the spacecraft carrying it to the moon malfunctioned, they turned their vacation house into mission control.

Amazon walked away from the $1.7 billion acquisition of iRobot as it faces questions from regulators in the European Union and United States.

Elon Musk, the electric car company’s chief executive, said he would “build products outside of Tesla” unless the board raises his stake to 25 percent.

A.I. is set to advance at a rapid rate, becoming more powerful and spreading into the physical world.