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Some judges may be more lenient when criminals offer biological explanations for their behavior. See “Psychopaths get time off for bad brains.”

Astronomers see a black hole pick up its matter-sucking activity right on schedule. Read “Black hole’s annual feast begins.”

Changing gut microbes may set the stage for weight gain. Read more in “Antibiotics linked to fat buildup.”

One olfactory brain region ramps up when scents go away. See “Smell deals with deprivation differently.”

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