18 Times Quantum Particles Blew Our Minds in 2018

There isn’t really just one kind of water molecule, a quantum-physics experiment revealed this year. Instead, there are two. Both are made up of two hydrogen atoms sticking up from one big oxygen atom, H2O. But in one kind of water, called “ortho-water,” those hydrogen atoms have quantum “spins” pointing in the same direction. In another kind of water, called “para-water,” those spins point in opposite directions.

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