Ships travelling between Lake Ontario and Lake Erie use the Welland Canal. Beginning with a conversation between characters Mathise, Geo, and Trig, they explain how a lock in the canal operates by gravity alone, without pumps. The characters use mathematics to solve problems such as how long the locks take to fill and how to express the volume and flow of water in more common terms (bathtubs of water ... Full description.

In this lesson, students define and classify the various ways in which numbers are used in forecasting and coping with the effects of a hurricane. This is followed up with an opportunity for research to compare and contrast these numbers as they apply to Hurricane Floyd and other recent hurricanes. There are also directions on how students can graph their findings. Full description.

This library features teacher-tested, standards-based engineering content for K-12 teachers to use in science and math classrooms. Engineering lessons connect real-world experiences with curricular content already taught in K-12 classrooms. The collection is searchable by keyword, grade level, or educational standard, and can be browsed by subject area, curricular unit, lessons or activities. Full description.