A few months after researchers on one team thought they had discovered a new family of rodent, another group snatched their glory by identifying the critter as a member of a family thought long extinct. Last year, scientists described the body of a squirrel-like rodent found for sale in a meat market in Laos. They believed it belonged to a previously undescribed family and named it Laonastes aenigmamus. [Locals call the rodent kha-nyou, according to The Associated Press.] But they failed to fully inspect the fossil record. Upon closer analysis of the creature's teeth, a second group of researchers determined...