Cows shake uncontrollably and later die. Sheep scratch at their fur until there are only patches left. People laugh one minute and become violent the next. These are all signs of brain diseases caused by prions. Scientists worldwide are searching for ways to stop these deadly proteins from replicating and spreading throughout the body. Titles will captivate both teen and tween readers as they do a deep exploration of interesting topics from the worlds of sports, the arts, science, history, and more. Each book features 8 chapters, with accessible text written at a reading level of 2.5 and below. Fascinating sidebars and facts are presented in the text, along with graphics including charts, tables, and infographics. Each book includes a glossary with key words and definitions to support readers.