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The brain's default mode network -- a series of connected areas that work hardest when most of the brain is at rest -- is active during daydreaming and mind-wandering. Many scientists believe the default network has two major hubs, one in the posterior cingulate cortex with the precuneus and one in the medial prefrontal cortex (shown above). Credit: Network overlay: Olaf Sporns/Indiana Univ. (modified by J. Korenblat); Brain photo: Omikron/photoresearchers

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