I Is Quark Matter Truly Non-Strange?

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This paper:

Bob Holdom, Jing Ren, and Chen Zhang. "Quark Matter May Not Be Strange." Physical Review Letters. DOI: 10.1103/PhysRevLett.120.222001

Proposes properties of elements further along the Periodic Table of elements - than the elements we have created so far.

I cannot evaluate the merit of the work. I arbitrarily assigned an 'I'.

Would someone else please comment? Thank you.
 

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