A person can measure their height at home by using an object, such as a pencil, to mark a wall and measure the distance. However, it is often easier to measure height with help from another person.
Our hats, of which we have very many, are firmly off this week to Frédéric Bouquet and fellow inhabitants of the 15-metre-high Laboratory of Solid State Physics in Orsay, France, for their paper “61 ...
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