Google secretly investing in zeppelins?

Zeppelins went out of style when the Hindenburg went down in flames over New Jersey. But Airship Ventures, a startup backed by quirky angel investor Esther Dyson, is trying to bring them back. With a little help from Dyson's friends. Airship's Zeppelin NT, the first to fly over the U.S. in 70 years, has just completed…
