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The current best estimate for the Earth’s weight is 5.9725 billion trillion tonnes, a difference of only about 1 per cent from Cavendish’s finding.

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It may not look it, but all the glass on Earth is flowing downwards under the relentless drag of gravity. Remove a pane of really old glass from the w...more

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Less than a decade after the Great Exhibition, iron as a structural material was finished—which makes it slightly odd that the most iconic structure o...more