Engineering
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How things are built, and why they don't fall down.
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Why a 660-tonne steel ball swings to keep Taipei 101 still
Skyscrapers sway in the wind, and gusts that match the tower's own rhythm can make it sway more and more. Taipei 101's answer is a 660-tonne steel pendulum…
Why traffic jams appear out of nowhere
Sometimes a motorway grinds to a halt and then clears up with no crash, roadworks or merge in sight. That's a phantom traffic jam, and it starts with one…