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There’s a new state of matter — and it’s weird. It’s made from light and is somewhere between a solid and a superfluid. It can’t be stirred, rotated, or even pushed.
“If you have some water in a pipe and you start pushing it, it will flow a little faster,” says Marzena Szymańska at University College London. “Whereas this fluid is so rigid that even pushing it will not change its velocity.”
The new state is made from “liquid light”. This is …