Could the human race fit into the size of the sugar cube?
Al physical thing are made of atoms which are 99.9999999999999 percent empty spaces. If you envision the nucleus as the size of the marble, then the electrons would be specks of dust a half mile away. This is how much empty space exists in a single atom when converted to a practical example. If you break up all the bonds in the atom from human bodies and leave only electrons and subatomic particles, all seven billion human bodies would fit in the space of the sugar cube. It would weight about five billion tons.
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Another way to look at this is if you were to take a regular sized apple and magnify it so that it was as large as the earth, then the each individual atom in the original apple would be the size of the entire apple within the new earth-sized apple.