Test-tube brain aces 'plop' quiz

Artificial intelligence is no longer the domain of clunky, mechanical robots and computers. It thrives inside a test tube where scientists have created an artificial neural network made out of DNA – essentially the beginnings of a brain – that was able to ace "plop" quizzes.

The team, led by bioengineer Lulu Qian at the California Institute of Technology, chose to build its network out of DNA molecules because, before brains evolved, molecular interactions inside single-cell organisms showed limited forms of intelligence such as searching for food and avoiding toxins.

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