An article in Science Daily published in April reports that bacteria found in soil may produce a chemical that stimulates production of serotonin.
"These studies help us understand how the body communicates with the brain and why a healthy immune system is important for maintaining mental health. They also leave us wondering if we shouldn't all be spending more time playing in the dirt."
Yet another reason to prioritize a visit to a National Park over video games and homework.

About Mike Barlow
The Trailmix.Net Blog is the work of Mike Barlow who blogs about Family Outdoor Recreation, Outdoor Education, and the exploration of National Parks, trails, and other wild places with his children.