Aluminum Leslie's Cube, 10 cm Sides Meters_Electrical Class-pack of economy handheld spectroscopes

Class-pack of economy handheld spectroscopes fitted with a rotating slit cap and internal diffraction grating for identifying constituent wavelengths in visible light sources

Six ovule orientations — orthotropous

this ball bearing roller coaster kit demonstrates potential and kinetic energy conversion plus forces and motion concepts

4 inches with thread-fitted adjustment

and penile root anatomy

Aluminum Leslie's Cube, 10 cm Sides Meters_Electrical Class-pack of economy handheld spectroscopesDemonstrates how surface finish affects thermal radiation, comparing the blackened, roughened, varnished, and polished faces of a water heated metal cube with an infrared sensor.