Confusion lingers over health-related pros and cons of marijuana

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

Gene variant linked to Alzheimer’s disease is a triple threat

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A genetic risk factor for Alzheimer’s disease works on multiple aspects of the disease, researchers report.

The way poison frogs keep from poisoning themselves is complicated

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Gaining resistance to one of their own toxins forced some poison dart frogs to make other genetic tweaks, too.

Telling children they’re smart could tempt them to cheat

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Kids who were praised for being smart were more likely to cheat, two studies suggest.

How a video game might help us build better cities | Karoliina Korppoo

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With more than half of the world population living in cities, one thing is undeniable: we are an urban species. Part game, part urban planning sketching tool, “Cities: Skylines” encourages people to use their creativity and self-expression to rethink the cities of tomorrow. Designer Karoliina Korppoo takes us on a tour through some extraordinary places users have created, from futuristic fantasy cities to remarkably realistic landscapes. What does your dream city look like?