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Royal Institution
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Caesium
In the build-up to the Christmas Lectures in 2012, the Royal Institution published a new video for every day of advent revealing the elements that really excite and inspire people. Despite forgetting his periodic table party trick, presenter Dallas Campbell explains why travelling around the world made him partial to element number 55. Dallas remembers carrying out an experiment using caesium atomic clocks to demonstrate that time is different depending on how fast you are travelling.
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