A Rice scientist has created what the Chronicle is calling "the darkest substance known to man," a carpet of carbon nanotubes that's reflective of less than .05 percent of light directly shined on it, making it a hundred times darker than the paint on a black Corvette. (Why a Corvette? Don't ask us...perhaps they got to expense the vehicle for "testing purposes" and decided they might as well go all out. At least, that's......