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.
Build a hand that realistically moves its fingers using shape memory allow technology!
Create all kinds of marble run combinations with this 80-piece Marble Run set!
Build your own 10 inch kaleidoscope with this great kit!
Build your very own smart robot!
Shake the Pet Tornado clockwise and watch the mini tornado funnel form before your eyes!
This high precision gyroscope will amaze you with rotational speed and ease of precision.