AMSTERDAM (AP) -- It's not green cheese, but it might as well be. The Dutch national museum said Thursday that one of its prized possessions, a rock supposedly brought back from the moon by U.S. astronauts, is just a piece of petrified wood. Rijksmuseum spokeswoman Xandra van Gelder, who oversaw the investigation that proved the piece was a fake, said the museum will keep it anyway as a curiosity. "It's a good story, with some questions that are still unanswered," she said. "We can laugh about it." The museum acquired the rock after the death of former Prime Minister Willem...