What Is a Gas? offers emergent readers a simple explanation of matter, a description of gases, and examples of how gases can change into different states of matter.

Explains the mechanical processes required to produce the things our homes needs to keep us happy and comfortable: electricity, water, and gas.

An introduction to chemical elements and organic compounds.

This book takes the reader right under the hood for a close look at the engines, gear systems, and brake mechanisms of modern automobiles. It also explains safety features. Other sections cover the history of the auto industry and what the cars of the future may look like.

"In 1914, the assassination of an Austrian archduke set off a disastrous four-year-long conflict involving dozens of countries with battles taking place in all parts of the world. World War I was the first to use planes and tanks as well as deadly gases that left soldiers blinded or "shell shocked" (a condition now called Post Traumatic Stress Syndrome). There were battles that lasted for months with opposing troops fighting from rat-infested trenches,...