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Humans & Society

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marijuana

HIGH HOPES  Cannabis plants such as this one yield marijuana and other substances that deserve expanded study for possible medical benefits, a large research review recommends. But negative physical and psychological effects of cannabis products can’t be ignored, the report says.

Timey wimey

TIME MACHINE  The TARDIS, disguised as a police phone box, is the time machine used by Doctor Who, one of many examples of fictional time travelers described by James Gleick in his book Time Travel.

Tibetan Plateau

HUNTER-GATHERER HANGOUT  New dates for hand- and footprints on a rock slab suggest that foragers lived year-round on the Tibetan Plateau, shown here, well before farmers did. Much about initial settlement of this high-altitude region remains unclear, though.

Humans & Society

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