New research suggests that just five minutes of outdoor activities, such as exercising in a park, working in a backyard garden or walking on a nature trail, will benefit mental health.

Global Challenges/Chemistry Solutions

In the green of health: Just five minutes of green exercise optimal for good mental health

Taking inspiration from trees, scientists have developed a battery made from a sliver of wood coated with tin that shows promise for becoming a tiny, long-lasting, efficient and environmentally friendly energy source. Their report on the device — 1,000 times thinner than a sheet of paper — appears in the journal Nano Letters.

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Global Challenges/Chemistry Solutions