Our brains are filled with billions of neurons, entangled like a dense canopy of tropical forest branches. When we think of a concept or a memory — or have a perception or feeling — our brain's neurons quickly fire and talk to each other across connections called synapses.
How these neurons interact with each other — and what the wiring is like between them — is key to understanding our identity, says Sebastian Seung, a professor of computational neuroscience at MIT.
This is MORNING EDITION from NPR News. I'm Renee Montagne.
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And I'm David Greene. We have learned this morning that North Korea has agreed to a moratorium on nuclear tests and uranium enrichment activities. This is according to State Department officials just back from a trip to China, where they met with North Korean negotiators. NPR's Michele Kelemen has more on what could be a step towards reviving nuclear disarmament talks.
In what could be a diplomatic breakthrough, the United States said today that North Korea had agreed to cease nuclear weapons tests and enrichment and will allow U.N. inspectors to verify activities at its main reactor.
The announcement comes just two months after the country's leader Kim Jong Il died and the Communist Party handed the reins of power to his son Kim Jong Un. The AP reports that the agreement also includes a moratorium on long-range missile tests.