One Lump or Two?
One lump turns out to be the correct answer. A sugar cube, that is. Marcus Chown, the author of The Quantum Zoo, was on KQED’s Forum program this morning, and he said that if we could remove all the empty spaces inside the atoms of all the people in the world, then the whole of humanity - all five billion or so of us - would fit inside one cube of sugar.
To give added credence to this proposition, here is a site that graphically illustrates just how much space there is between the proton and the electron of a hydrogen atom.