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With the Worm Gear Box, High Efficiency, it is possible to have high power or high speed with two different gear ratios

Determine the Many Properties of Matter

The Princeton Review Coloring Workbook Series uses a break-through approach to teaching these difficult concepts; engaging students in the learning process by ushering them through detailed diagrams and having them perform the seemingly simple task of coloring the structures as they locate and identify them.

Add Some Momentum To Your Physics Lessons

These delightful young reader books use splendid cut-outs, eye pleasing illustrations and even an amusing song or two to guide students through the changing seasons, to teach them that weather can be observed and that weather can vary from day to day and from season to season, and that weather can affect what we do and what we wear.

Learn to identify species.

Prepare designs easily without premature hardening.

This aluminum tuning fork has sliding weights on each tine.

Design bugs in their natural environment.

Plastic Wheels

The properties of radioactivity and the concept of half-life determination can be difficult subjects for students to fully understand.

Make Sure the Water is Free of E. coli

This set is economical, durable, and versatile.

Best Seller!

Tandem pulleys give students a clear picture of mechanical advantage and velocity ratio in a pulley system.

Includes set of six tuning forks: 125, 250, 500, 1000, 2000, and 4000 Hz.