I found this articles very interesting about getting children out in nature & playing in dirt.Hope you find it interesting as well.
http://bangordailynews.com/2017/07/19/homestead/how-gardening-can-help-build-healthier-happier-kids/
https://www.washingtonpost.com/news/parenting/wp/2014/10/21/10-ways-to-get-your-kids-out-in-nature-and-why-it-matters/?utm_term=.f02c7e56cab7
HAPPY EXPLORING!