The more modern archaeologists learn about Mayan civilization, the better they understand its intellectual achievements. Not only were numerous scientific observations and predictions made by Mayan astronomers, but the people in general seem to have had a strong grasp of sophisticated mathematical concepts. We know this from the fact that the writings of the Mayan religious scribes exhibit a high degree of mathematical competence. The argument's reasoning is most vulnerable to criticism on the grounds that the argument ['relies on two different senses of the term "scientific"', 'overlooks the impressive achievements of other past civilizations', 'bases a generalization on a sample that is likely to be unrepresentative', 'fails to provide an adequate definition of the term "intellectual achievement"']