Evidence for oxygenation of Fe-Mg oxides at mid-mantle conditions and the rise of deep oxygen. - Liu, Jin; Wang, Chenxu; Lv, Chaojia; Su, Xiaowan; Liu, Yijin; Tang, Ruilian; Chen, Jiuhua; Hu, Qingyang; Mao, Ho-Kwang; Mao, Wendy L (National Science Review, 2021)