A new study finds that even just seeing a tree or hearing a birdsong will up your state of mind. Plenty of research shows that spending time in nature has powerful health benefits. For people working in cities, that’s not always possible, but there an approximate way to stay positive at least: New research shows that even if you’re trapped in an office or only able to step outside for a moment, small exposures outdoorsy indicators–seeing trees, the sky, or hearing a birdsong–can boost your mood.Read Full Story