Hi, yes I have heard of it. But I was reading that you shouldn't do it near high EMF fields (so often in your own home is not good then, just in nature far from cell towers/power lines etc) but I have gone barefoot in the house my whole life as I had learned long ago it's not good to where your shoes in the house as they are dirty (oil from cars on streets, dog poop etc) plus I just like to be barefoot. Problem with barefoot in nature (though I have done it plenty because I like that too) is you could get parasites coming in through your feet. Also I am a dog walker (professional level for many years) and I know first hand that all public parks are FULL of dog shit and pee (picking up poop with a plastic bag does not entirely remove it from the grass I am sorry to say). So I would advise to never walk barefoot in public parks (or nature parks with trails where people take there dogs) or even lie in the grass without a blanket under you. So again as much as I love to be barefoot I don't know how safe it is outside (and I have had years battle with parasite infections.. I also had foolishly gone barefoot in the jungle in India years back but that was because leeches were getting into our shoes and covering out feet sucking out our blood, so having them off meant we could push them off. I also am not sure about the 'science' behind this either. Seems a bit suspect. Shoes have been around for thousands of years for a reason I am guessing.