Crystal Healing Scientific Evidence

I had heard of Crystal Healing all of my life but I assumed that it was quackery.A friend, who was a believer, asked me to take a look and find the scientific basis of Crystal Healing.My career has been in Aerospace Engineering so he thought I could surely find the scientific basis for something in which he so strongly believed.I felt that I had to check it out for my friend.I realized that any scientific basis for Crystal Healing would have to require some sort of exchange of energy betwee...