21.   Inside each nucleus are even smaller particles, called quarks and gluons, that combine to make protons and neutrons.

22.   The smaller particle size allows more precise placement of the dots on the paper, and that is why the new type of toner is called UltraPrecise.

23.   The sewage then flows into tanks called digestors, where sludge is broken down into smaller particles.

24.   He said it was likely the fragment was comprised of smaller particles which broke up when it hit Jupiter.