Researchers formed stable vortex knots in chiral nematic liquid crystals and used electric pulses to reversibly fuse and split them into different knotted forms. (Nanowerk News) The knots in your ...

When you stir liquid in a tumbler, you are forcing it to spin in circles. For anything to move in a circle, it needs an inward pull. In a liquid, this inward pull comes from pressure differences: the ...

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