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Readers puzzled by proton's properties

Your comments on the April 29, 2017, issue of Science News

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3:45pm, May 31, 2017

Proton puzzler

Uncertainty over the proton’s size, spin and life span could have physicists rethinking standard notions about matter and the universe, Emily Conover reported in “The proton puzzle” (SN: 4/29/17, p. 22).

Readers wondered about the diameter (or size) of the proton, which has three fundamental particles called quarks rattling around inside. “Still scratching my head over how combining three dimensionless quarks ends up forming a proton with a ‘diameter,’ ” online reader Down_Home wrote. “Maybe that word doesn’t mean what I think it means.”

The three quarks within the proton are only

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