Photograph by Max Aguilera-Hellweg, National Geographic

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The PR2 robot was developed to be easily customized for research. Here it's being used to deliver mail.

Photograph by Max Aguilera-Hellweg, National Geographic

Robot Revolution? Scientists Teach Robots to Learn

For robots to really help humans, they'll need to learn more like we do.

Image of the 125 Anniversary logo Part of our weekly "In Focus" series—stepping back, looking closer.