Rolling around ideas about rolling stones and moss

Rolling stones mostly just gather speed.

I guess they just aren't sticky enough.

I wonder if there is such a thing as double-sided moss?

I should try the experiment again perhaps, because I'm not sure the moss was ready.

On the other hand,

It has been suggested that painting yogurt on the stones helps them gather moss.
In that case my next rolling experiment will have to be a bit messier.