Famous explorer Bob and his dog Rick have been around the world and even to the Moon, but their travels through the quantum universe show them the greatest wonders they''ve ever seen. As they follow their tour guide, the giddy letter h (also known as the Planck constant), Bob and Rick have crepes with Max Planck, talk to Einstein about atoms, visit Louis de Broglie in his castle, and hang out with Heisenberg on Heligoland.