Did you know in the UK a quart is smaller than in America? This explains why a standard unit of measure is necessary for volume. Young scientists learn the similarities and differences between five different units used to measure volume....

All human infants are lactose tolerant, yet some adults are lactose intolerant—why is that? Individuals discover the process of gene mutation through a study of the lactase gene (LCT). They understand the geographic connections,...

Frederick Sanger won two Nobel prizes for protein sequencing and DNA sequencing. Young scientists learn about Dr. Sanger's research and amazing discoveries. They read an article and a biography, view videos and animations, and apply...

Seven superb slides sharpen science students' scoop on soil. In viewing them and reading the accompanying captions, your class will uncover the importance, different types, horizons, and protection of soil. They can then assess their new...

In this middle school mathematics worksheet, students use cross multiplication to solve proportions. The interactive worksheet has a "step-by-step" link for an in-depth solution. The one page worksheet has twenty problems.

In this grammar worksheet, students are assessed on their knowledge of homonyms. Students choose a homonym to complete the sentence.

Learn how to measure the inside diameter, outside diameter and the depth of different parts. This interactive activity shows you six different calipers. Once you understand the exercise, then you can test your knowledge with a quiz.