Describes what makes people cough, sneeze, burp, yawn and have other such reflex responses and explains the role these actions play in maintaining health.

Why do people yawn? Is it because we need oxygen? Or do we yawn to cool off our brain? The answer is, scientists aren't totally sure just yet, but they have man

Common Core's English resources empower educators to meet the expectations of the Common Core State Standards (CCSS) for English Language Arts (ELA) and build e

What is a capillary? How do joints work? Why do some muscles work in pairs? Investigate the curious world of life science. Find out for yourself about the human

The first books to present specific guidance for teaching the Common Core State Standards Forty-three states plus the District of Columbia and the U.S. Virgin I