Eric Walker placed Uranium glass under Glass

Eric Walker added Wood can easily be turned transparent to make energy-saving windows | New Scientist to Glass

Eric Walker added Glass - Wikipedia to Glass

Eric Walker added The Romans Called it ‘Alexandrian Glass.’ Where Was It Really From? - The New York Times to a number of topics

Eric Walker added Glass and Cement to Amorphous solids, and added Amorphous solids to Atoms, molecules, chemicals, minerals, materials and compounds

Eric Walker added a number of links to Glass, and added Glass to Amorphous solids