Source: Antidepressant Microbes In Soil: How Dirt Makes You Happy http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/antidepressant-microbes-soil.htm
Source: https://brightside.me/inspiration-health/what-happens-to-your-body-when-you-exercise-for-30-minutes-a-day-243210/#image6952510