LOS ANGELES (AP) — Five months after NASA investigators and local agents swooped into a Riverside County restaurant and detained a woman who was trying to sell a moon rock, no charges have been filed and NASA isn't talking.The target, Joann Davis, a 74-year-old grandmother who says she was trying to raise money for her sick son, tells The Associated Press the lunar material was rightfully hers and had been given to her space-engineer husband by Neil Armstrong in the 1970s.The strange case centers on a speck of moon rock encased in an acrylic-looking dome that appears to be a paperweight.For years, NASA has gone after anyone selling lunar material gathered on the Apollo missions because it is considered government property, so cannot be sold for profit.