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Psychology

Confusion lingers over health-related pros and cons of marijuana

50 years ago, the effects of chronic marijuana smoking on mental health were hazy. They still are.

Earth

Plate tectonics started at least 3.5 billion years ago

Analyses of titanium in rock suggest plate tectonics began 500 million years earlier than thought.

Astronomy

Ultrahigh energy cosmic rays come from outside the Milky Way

The biggest cosmic ray haul ever points toward other galaxies as the source of the rays, not our own.

Paleontology

Shhhh! Some plant-eating dinos snacked on crunchy critters

Scientists studying dinosaur poop found that some duck-billed dinos cheated on their vegetarian diets by snacking on crustaceans.