"Bioweapons have been used throughout history. They are made from things in nature and are used to kill. Find out about several common germs and how they have been used as bioweapons. Engage your most struggling readers in grades 4-7 with Red Rhino Nonfiction! This new series features high-interest topics in every content area. Visually appealing full-color photographs and illustrations, fun facts, and short chapters keep emerging readers focused....