Text and illustrations provide young readers with information about seesaws, nutcrackers, and brooms--three simple machines that are really just different types of levers.
A blizzard occurs when severe snow is accompanied by low temperatures and wind. Details development, warning signs, destructive force and self protection for these winder disasters.
Discusses the science of epidemiology, which concerns itself with the incidence, distribution, and spread of disease, with specific application to AIDS.
Surveys the history of air travel accidents and safety, common causes of accidents, and methods for preventing them and maximizing chances of survival after a crash.
