They may be hidden in your body, or other places, and impossible to see with the naked eye, but there are many components to living things that are super important--we just can't see them! Cells, germs, atoms, and DNA molecules are a few key examples, as they're inside each of our bodies and play impactful roles despite humans not being able to see them. Readers learn all about these components and more in this set, as they uncover some of the basic building blocks of life that are powerful yet tiny.