"The Mystery of Lyle and Louise"

1 pound of black sand packaged in a heat-sealed bag.

Reveal the Nature of Color and Light

Lets You Control Location and Depth of Measurements

Real-world climate and sustainability investigations, powered by the popular BBC micro:bit!

A redefined and extremely robust hand-held gyroscope.

Bulk hole plates to expand your TeacherGeek collection

Squeeze and Study

For Versatile Optical Applications

Ceramic Ring Magnets have a high resistance to demagnetization and don't need a keeper.

Glass thermometers with Enviro-Safe Black liquid.