Reading Advocate: The energy solution may be sun and sand. No, I am not referring to a long relaxing vacation in Santo Domingo or swimming in Key West. I am referring to solar and silicon, two items that combine to make photo voltaics operate; more simply stated: Solar Energy. Ken Zweibel, James Mason, and Vasilis Fthenakis authored the cover feature in January’s 2008 Scientific American magazine: "A Grand Plan for Solar Energy." And, grand it is. Their vision is for solar energy to provide 69 percent …