Guinea and Feather Apparatus, 20" Glass Tube Science at Home_Chemical Science Seventy-eight-piece molecular model set with

Seventy-eight-piece molecular model set with 45 atoms and 33 bonds for building basic organic and inorganic structures

101-piece teacher-grade molecular model set with 51 atoms and 50 bonds covering carbon

and mechanical-advantage experiments

securing a thermometer to any support rod at the angle needed for hands-free temperature monitoring during an experiment

Guinea and Feather Apparatus, 20" Glass Tube Science at Home_Chemical Science Seventy-eight-piece molecular model set withDrops a dense object and a feather together inside a 20 inch evacuated glass tube, showing that air resistance not mass accounts for differences in fall time under gravity.