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A GPS app can plan the best route between two subway stops if it has been specifically programmed for the task. But a new artificial intelligence system can figure out how to do so on the fly by learning general rules from specific examples, researchers report online October 12 in Nature.
Artificial neural networks,
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, computer programs that mimic the human brain, are great at learning patterns and sequences, but so far they’ve been limited in their ability to solve complex reasoning problems that require storing and manipulating lots of data. The new hybrid computer links a neural network to an external memory source that works somewhat like RAM in a regular computer.
Scientists trained the computer by giving it solved examples of reasoning problems, like finding the shortest distance between two points on a randomly generated map. Then, the computer generalized that knowledge to solve new problems, like planning the shortest route between stops on the London Underground. Rather than being programmed, the neural network,
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, like the human brain, responded to training: It can continually integrate new information and change its response accordingly.
The development comes from Google DeepMind, the same team behind the AlphaGo computer program that beat a world champion at the logic-based game of Go (SN Online: 3/15/16).

Excavations at Tanzania’s famed Olduvai Gorge have uncovered the oldest known fossil hand bone resembling those of people today. The bone from a hominid’s left pinkie finger dates to at least 1.84 million years ago and looks more like corresponding bones of modern humans than like finger fossils of previously discovered Olduvai hominids, say paleoanthropologist Manuel Domínguez-Rodrigo of Complutense University in Madrid and his colleagues.
This ancient hominid’s entire hand probably looked humanlike,
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, the researchers propose August 18 in Nature Communications. An Olduvai hominid with humanlike hands would have been capable of making stone tools,
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The new finger fossil is more humanlike than comparably ancient Olduvai hand fossils from Homo habilis, or handy man,
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, and Paranthropus boisei,
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, or Nutcracker Man,
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, the scientists find. ? ?

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