This book is part of the innovative Code Reader series for struggling readers ages 8 to 12. Books in this unique series feature pronunciation keys following difficult words throughout the text. For example, the word "coyote" might be followed by: (ky-OH-tee). These pronunciation keys help make the books easier to read than traditional beginning chapter books. If Only They Had Known (Sickening Mistakes They Used to Make): Many things in the past caused sickness, suffering, and even death. Lots of those things could have been avoided if only people had known what we know today. This book looks at some wild, gross, and surprising things from the past that are bound to make readers say, "If only they had known!".