“Earthing” simply means to physically reconnect with the earth. Walking barefoot, laying in the grass, and hugging a tree are all examples of earthing, and these practices have been gaining significant attention in the medical community due to its surprising influence on biological health and its simple application.
It turns out that walking barefoot in the grass can prevent and even cure disease, amongst a whole host of other health benefits that we will look at.
So how exactly does this work?
The key is the transference of electrons on the surface of the earth into the skin.
“Direct physical contact with the vast supply of electrons on the surface of the Earth. Modern lifestyle separates humans from such contact. The research suggests that this disconnect may be a major contributor to physiological dysfunction and unwellness.
Reconnection with the Earth’s electrons has been found to promote intriguing physiological changes and subjective reports of well-being.
Earthing (or grounding) refers to the discovery of benefits—including better sleep and reduced pain—from walking barefoot outside or sitting, working, or sleeping indoors connected to conductive systems that transfer the Earth’s electrons from the ground into the body.”
The abundance of electrons causes improved sleep, reduced pain, and lowered stress levels for example. 
Grounding also appears to be one of the simplest and yet most profound interventions for helping reduce cardiovascular risk and cardiovascular events by lowering red blood cell aggregation and reducing blood clumping. Walking on the grass barefoot can actually help protect you against the world’s number one killer of cardiovascular disease. 
For the rest of the story: http://humansarefree.com/2014/01/earthing-could-be-most-important-health.html