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Our bodies’ internal clocks may interpret twilight’s bluish hue as a signal to get some rest.

Mouse map

MOUSE MAP  As a mouse meanders farther away from a border (one path highlighted in blue), a grid cell’s pattern of behavior (red) becomes less regular, distorting the animal’s internal map. Hitting the border can reset it, a study suggests.

Liquor and a cigarette

TWICE THE VICE  Nicotine eases the path to excess drinking, a study in rats suggests.

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