sunlight

Seasonal Affective Disorder, a common mood disorder that was first described by Dr. Norman Rosenthal in 1984, is mostly discussed in terms of how it affects people in winter.
When I found out about summer SAD a few years ago through some online sleuthing, I felt relieved. I finally knew what was going on with me.

Being outdoors helps with everything from bone growth to life longevity. Why not swap out your Yosemite screensaver for some real-life trees?