Tusen gånger starkare (A Thousand Times Stronger) is a 2006 young adult novel written by Christina Herrström.

[4] The book is about the power between the two sexes (boys and girls).

When a new girl, Saga, comes to the class, the situation is changed; she breaks the "rules" for showing how girls should act.

At first the teachers like her actions but when the other girls follow her advice, the situation becomes chaotic.

In 2010 a film based on the book was produced.