These 1/4 inch thick black streak plates are ideal for testing the hardness or softness of minerals, as well as determining the color of lighter-colored minerals. By scratching the mineral in question against the plates, students or teachers can determine these properties by observing the quantity and hue of the residue left behind. Excellent for use in the classroom, or at home for aspiring geologists.
This magic bird defies gravity before your very eyes!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Build your own 10 inch kaleidoscope with this great kit!
This is a great clean heat demonstration model for the classroom setting!
The Wimshurst Machine is a high quality static machine for student labs.
Build a hand that realistically moves its fingers using shape memory allow technology!