A major goal for neuroscientists is to build a complete wiring diagram of the human brain. Such a feat has already been achieved for the nematode worm Caenorhabditis elegans. But going from worm to human requires a serious leap: C. elgans has 302 neurons connected together through 7,000 synapses; the human brain has an estimated 10 billion neurons, each of which has an average of 10,000 synaptic connections.
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