According to the United States Department of Energy, the wide range of its current and projected uses, together with the lack of any immediately suitable replacement, makes dysprosium the single most critical element for emerging clean energy technologies.Dysprosium is also used, in conjunction with vanadium and other elements, in making laser materials and commercial lighting.Learn more about Dysprosium here: en.wikipedia.org/wiki/Dysprosi… , and here: www.rsc.org/periodic-table/ele…