Eric Walker added a number of topics and a number of links to Physics, and added Physics to Science, engineering, mathematics and the humanities

Eric Walker added a number of topics and a number of links to European Organization for Nuclear Research (CERN), and added European Organization for Nuclear Research (CERN) to Institutions researching physics and Switzerland

Eric Walker added European Organization for Nuclear Research (CERN) to Institutions researching physics, and added Institutions researching physics to Physics