Space

Every human on planet Earth is made up of millions and millions of atoms which all are 99% empty space. If you were to remove all of the empty space contained in every atom in every person on planet earth and compress us all together, then the overall volume of our particles would be smaller than a sugar cube. https://interestingengineering.com/science/due-to-the-space-inside-atoms-you-are-mostly-made-up-of-empty-space

But .. something is in there ...