Isaacs, April

This book examines waves that travel through a medium and electromagnetic waves that do not require a medium and describes their characteristics, the ways in which they behave, and their practical application in our daily lives.

This book presents 22 selections offering diverse opinions about Al Qaeda, the roots of the organization, and the world's response to the group's acts of terror.

Explains what causes tornadoes, hurricanes, and tsunamis and how to stay safe when they strike. Describes emergency preparedness procedures for these natural disasters.