Eric Walker added a number of topics and We found a new type of stellar explosion that could explain a 13-billion-year-old mystery of the Milky Way's elements and Is It Time to Upend the Periodic Table? - The New York Times to Chemical elements, and added Chemical elements to Chemistry and Atoms, molecules, chemicals, minerals, materials and compounds

Eric Walker added Research News - Large Tin Monosulfide Crystal Opens Pathway for Next Generation Solar Cells | Tohoku University Global Site to Tin monosulfide, and added Tin monosulfide to Sulfur and Tin

Eric Walker added Tin monosulfide to Tin, and added Tin to Chemical elements