Senate Democrats blocked a first-of-its-kind bill aimed at regulating cryptocurrency in the US amid Democratic concerns over President Donald Trump’s cryptocurrency dealings.

Think you’re a pro at solving hard riddles? Put yourself and others to the test, and find out. (Don't worry—answers are ...

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Nano Science Technology Institute, Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea Yonsei-KIST Convergence Research Institute, Seoul 03722, Republic ...

School of Physics and Technology, Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China ...