I don't type perfectly. Yes, I misspell things like engrish. Many materials slow down light. That is what the refractive index is for. Palladium black is the material that they are talking about. As for cold fusion, it really is much more simple to experiment with. The fact that we are told that cold fusion is not possible and that nobody has reproduced it is a complete sham.
http://jlnlabs.online.fr/cfr/diycfr/index.htm
http://jlnlabs.online.fr/cfr/logbook/rh/index.htm
http://jlnlabs.online.fr/cfr/ppclkrs/index.htm
I have done simple cold fusion reactions on my back porch. I have provided the sources for my information. Anyone with a little lab and an afternoon can do this stuff.