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SciShow
The Nuclear-Powered Clocks of the Future
Atomic clocks are the best timekeepers humanity's got these days, but scientists are working toward something even better: a SUB-atomic (aka nuclear) clock.
University of Nottingham
University of Nottingham: Periodic Table of Videos: Actinium
Actinium is a very radioactive and dangerous element as you will hear about in this video. [4:36]