Eric Walker added a number of topics and a number of links to Atoms, molecules, chemicals, minerals, materials and compounds, and added Atoms, molecules, chemicals, minerals, materials and compounds to Nature

Eric Walker added Magnetite to Magnetic materials, and added Magnetic materials to Magnetism and Atoms, molecules, chemicals, minerals, materials and compounds

Eric Walker added Dunite and Collections: Iron, How Did They Make It? Part I, Mining – A Collection of Unmitigated Pedantry and Magnetite - Wikipedia to Magnetite, and added Magnetite to Magnetic materials and Iron oxides

Eric Walker added a number of topics and a number of links to Magnetism, and added Magnetism to Electromagnetism