"Climb aboard! Imagine cruising the countryside on a big, comfortable touring bike, rocketing down a strip on a drag bike, or gripping the ice in an extreme speedway race! If these excite you, then your are a motorcycle fan" "[summary]"--Provided by publisher.
In this series, you'll explore six simple machines. Each book describes a different one and explains how it helps make our work easier. Experiments and activities give you the chance to work with each simple machine. You'll be surprised at how many you've been using all along! - Back cover.
A brief biography of nineteenth-century French scientist Louis Pasteur, discussing his study of germ microbes and his discovery of the process now known as pasteurization in which germs are killed with heat.