In this Benford's Law learning exercise, high schoolers read about the first digit frequency of numbers. Students solve 3 problems about sunspot numbers, solar wind magnetism and the depth of the latest earthquakes by using on line sites...

Middle school energy experts read about the relationship between energy use and cost-efficiency. Then they work through a couple of scenarios to determine which approach is more cost-effective.

Students evaluate energy-related purchases. In this consumer awareness lesson, students visit an appliance store and rank the products' cost effectiveness by using a mathematical formula.