Like millions of parents around the world, Pragya Agarwal has spent countless rainy afternoons watching Frozen.
Back in 2013, when Disney first released its animated tale of two spirited princess sisters who definitely don’t need rescuing by any prince, she watched it with her now grownup eldest daughter. But it was her twin girls, now seven, who fell most deeply under the spell of Elsa, Anna and their magical ice kingdom. The girls have watched all the spin-offs, got the costumes, and though they’re starting to grow out of cartoons now, they still love rewatching Frozen; the whole family sings along lustily to its catchy big number, Let It Go, an epic power ballad about embracing your true nature and rejecting other people’s expectations. But their mother, a behaviour scientist and visiting professor at Loughborough University in Leicestershire, finds the song interesting on a different level.