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

and 400 ppm

letting students wire the panel directly to each load and watch how light powers different output devices

Diamond lattice kit with 39 carbon atoms and 60 connectors for building the tetrahedral covalent network that gives diamond its exceptional hardness and optical properties

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.