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You can keep temperatures down without the cost – or environmental price – of air conditioning. Here’s some tips and tricksThe best fans to keep you cool in 2026 – tried and testedIn the UK we are used to worrying about our homes being warm enough, but after struggling to cope wi

Rotaxanes are dumbbell-shaped mechanically interlocked molecules in which one or more ring-shaped molecules are threaded through a linear segment, known as the axle. To keep the ring from sliding off, two bulky groups, sometimes called stoppers, are added to the ends of the axle.