Finding Khan Academy Kids has been a relief for working parents. But with its surge in popularity has come rising costs.

Parents learn to pick their battles. It's crucial for survival. When it comes to screen time? That's a fight just about every parent now struggles with. On one hand, you sometimes just want some peace ...

Sal Khan is the founder of Khan Academy, a nonprofit that provides free, online-learning tools that are used by more than 30 million kids, educators, and parents.