Animated STEM story for grades 1-3, introducing atoms all the way down to quarks

 The first is a STEM story I wrote some years ago, but just had the text. It is titled Little Sue and the Rock, and is a story for children in grades 1-3. The goal is to introduce to younger children the concept of atoms, and what atoms are made of. It goes through electrons, and a nucleus, and then that a nucleus is made of protons and neutrons. But then it introduces the fact that protons and neutrons are made of still smaller pieces called up and down quarks! Quarks are typically unknown even to high school science classes, and therefore high school students, which seems silly to me since I think it is fundamentally we present the most basic ideas of what the world is made of in simple, and accurate, terms.