Vinod Khosla is pouring his own millions into science experiments to counter global warming — and to prove he’s the smartest guy in the Valley. Making cement without also making carbon dioxide seems impossible; the basic chemistry of the process releases the gas. But maybe that’s not really true, Stanford University scientist Brent Contstantz began thinking last year. Of course, it was only a theo

Andy Rubin | photo by Russ Quackenbush Andy Rubin | photo by Russ Quackenbush It’s too good to be true. That’s what Andy Rubin was thinking back in 2005. He’d worked for more than a decade at various tech outfits, including a stint at Apple, and now Google was interested in acquiring Android, his latest venture. When he dug around to see if the Internet giant would be a good fit, Rubin met with wh