"From the Great Fire of London to the Challenger explosion, earthquakes, crashes, floods, and accidents have been major turning points throughout history. In 100 Disasters That Shaped World History, young readers will be introduced to some of the most notorious disasters known to mankind, discovering how these fateful events unfolded-and how they changed the world as we know it"--

"Relevant images match informative text in this introduction to pulleys. Intended for students in kindergarten through third grade"--

"Relevant images match informative text in this introduction to screws. Intended for students in kindergarten through third grade"--

"Relevant images match informative text in this introduction to inclined planes. Intended for students in kindergarten through third grade"--