PROTONS AND NEUTRONS are familiar as tiny solids, but particle accelerators can melt them into what's called a quark-gluon plasma, or QGP. Studies of the superhot material, first done about a decade ago, have revealed QGP is the hottest, least viscous known liquid and is capable of forming the smallest drop of liquid ever seen. And now, it's also the fastest known spinning liquid, as reported in August by the STAR collaboration in Nature.
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