Headscratchers / The Simpsons: Bart vs. the Space Mutants

• Why does Maggie require the most proof of the alien invasion and Lisa the least?
  • Well, since the alien invasion in this case IS real, the most intelligent person, who is the most likely to think outside the box, would require the least amount of evidence to believe it. On the other hand, the one whose cognitive skills are still developing — and for whom everything is new and strange — would need the most amount to understand something unusual is happening.