Scientist and shaman use a different language to tell the same story. Both are truth spoken from a different perspective.
Current popular ideas in theoretical physics are attempting to explain the energy in the universe. String theory tells us that unimaginably tiny vibrating strings of energy (in nine different dimensions!) are the building blocks for every particle of matter. Another theory tells us we live not in a uni-verse but a multi-verse, an unimaginably giant place that has an infinite and ever growing number of universes contained within it. The scientists tell us the mathematics behind these two theories support each other. Trouble is, they don't currently have a way to test and prove these theories. Until they do, their ideas can't be considered hard science. But that doesn't stop those scientists from continuing their research. They toil away, hoping that in a hundred years or so we'll have a method to prove their theories right.
We need the same kind of determined patience in the field of the healing energy arts. While a limited amount of science has been applied to measure healing outcomes (e.g. reduced blood pressure) we have no objective way of proving the theory behind the healing. To tell the truth, I really don't know why Reiki and Shamballa work. What I have received as explanation are the centuries-old stories passed from master to student. But from experience I do know it works, and I will keep using it to heal people while I wait for the scientists to figure things out. In the meantime, I have the language of the Shaman.