Mom: I loved your book, and now my 9-year old son is reading it, and enjoying all your puns and bad jokes (not to mention the science!).
Son: The figure on page 61 seems to imply that every time the sun, moon and/or earth line up, there should be either a solar or lunar eclipse. Can this figure be redrawn to show what actually happens when they line up? Why doesn't an eclipse happen every time they're in line?