Blood will Flow

Calling any quantum physicists amongst you! 

I was listening to Brian Cox on the radio this morning, talking about his new book.  And he was saying again about how everything is made up of these tiny particles, which each can be simultaneously anywhere in the universe from one moment to the next.  Which is, you know, bloody marvelous and exciting.  BUT - can someone please explain to me if that is the case, how does anything have any form or stability?  How do these ever moving particles come together and make a rock or a tree or something as amazing and complicated as a person?  If everything is always in motion, how to we hold it together for long enough to have a single coherent thought?

Bloody physics. It blows my mind!