The Disney film "Frozen" earned more than $1.2 billion at the box office, making it the number one animated film of all time. But why was the story of a queen with icy powers and her younger sister so successful?

Two California psychologists -- who also happen to be sisters -- recently decided to analyze what makes "Frozen" more appealing to kids than other princess fairytales.

Yalda T. Uhls is a Senior Scientific Researcher at UCLA, and her younger sister Maryam Kia-Keating is an Associate Professor of Clinical Psychology at UC Santa Barbara. They joined Take Two to breakdown the psychology behind kids' obsession with the film. And, it's not just the catchy songs.

Click on "Listen Now" above to hear the interview.