OK, she can watch TV

I'm just about to walk down the stairs when I hear a bang: something has hit the floor outside the girls' room.  Molly appears.

"They DO roll, Mummy.  Rocks roll.  That's what they do."

"Really?"

"Yes. Taury from Dinoworld says 'Rocks don't roll'."

"And what do you think?"

"They DO roll."