Lake Mead boaters issued warning: "Dangerous lake conditions" Texas is overhauling what students will learn in social studies and history. Here's what to know Opinion: The double standard on executive ...

School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, P. R. China ...

Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, Vienna A-1060, Austria ...

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