What do I think? It's hogwash. Yellen was not a scientist, not a doctor, her findings were not published in scientific journals, and never reviewed. The machine she used to measure frequency has never been used commercially, the numbers she quotes don't match up with the frequency numbers from legitimate researchers, and she did her "research" with an agenda, which was to find scientific basis for some of the passages in religious texts. Her entire background is in religion, not in science.