Explains what a crime scene is, describes what may be considered evidence in a criminal investigation and how it is collected, and discusses cases in which forensic evidence was used to help convict or clear a suspect.
Introduces the nature, sources, and uses of electricity and discusses what life was like before electric appliances and how saving electricity causes less pollution.
We use all kinds of machines and instruments to see, hear, record, measure, and detect changes in the world around us. Explore the variety of tools scientists have created to help in these investigations.
Describes the equipment found in a crime laboratory, explains how it is used to process evidence, and provides examples of cases that were solved using forensic evidence.
"What makes your ears pop in an elevator? What makes hot air balloons float up in the sky? Find out about all the things amazing air can do in this fun book." -- p. 4 of cover.