A metal cylinder used for setting the international standard of the kilogram has been slowly gaining mass over the years. This article describes the impact of that mass gain and what scientists are doing to shrink it back to size.

This resource provides information about obesity, and the importance of weight control.

On this site, find a variety of materials to help students understand the conservation of matter. Create lessons that allow students to measure and graph quantities that could show even if matter is heated, cooled or combined with other...