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The women who lack an odour-related brain area — and can still smell a rose

Knots form not only in everyday items such as headphone wires, but also in less-tangible realms, from electromagnetic field lines to the quantum states of electrons in solids.

Then, using a magnetic field, the scientists aligned the magnetic axis of the gas along curves that twist — like a skewed bundle of spaghetti — around a series of doughnut-shaped surfaces, which are nestled inside one another.