Aluminum Leslie's Cube, 10 cm Sides Meters_Electrical LDPE wash bottle with a

LDPE wash bottle with a two-color isopropanol identification label

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

The waves generate nodes & antinodes & their full wave length or half wave length can be measured

Six ovule orientations — orthotropous

and penile root anatomy

Aluminum Leslie's Cube, 10 cm Sides Meters_Electrical LDPE wash bottle with aDemonstrates how surface finish affects thermal radiation, comparing the blackened, roughened, varnished, and polished faces of a water heated metal cube with an infrared sensor.