Agence France-Presse: Stealth start-up Bloom Energy on Wednesday publicly unveiled an innovative fuel cell that promises to deliver affordable, clean energy to even remote corners of the world. Compact Bloom Servers built with energy cells made from silicon — a plentiful element found in sand — made their formal debut in an eBay building here partially powered by the energy source. “Bloom fuel cell technology has the potential to revolutionize the energy industry,” California governor Arnold …