If the new season has put a spring in your step, it might be because longer days naturally replenish your vitamin D. Your body needs this fat-soluble vitamin to function properly, as it affects many areas of your body, including your bones, brain, immune system, and muscles. But unlike many other vitamins, it’s easier to get your daily dose from an afternoon stroll than the foods you eat. Click through the slideshow to learn more about how vitamin D is one of the most important and fascinating nutrients you consume—and make!—on a daily basis.

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Faux-tosynthesis: The Artificial Leaf that Could Power Your Home

A "Holy Grail" of solar research has reportedly been achieved: MIT scientists have created a fake "leaf" that mimics photosynthesis.

Call it faux-tosynthesis. An MIT research team lead by Daniel Nocera revealed an "artificial leaf" that uses the sun's rays to produce energy. Developing an energy source modeled on photosynthesis like this has long been a goal of energy science. (We actually highlighted Nocera's project in the GOOD 100 way back in 2009.)

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