[Doctor Stochastic]

I don't much like accepting as factual something which "must exist" solely because one variant of arcane math says it must.

However, this worked for both neutrons and neutrinos. Both were hypothesized (to make the math work out) and both were unobserved for some time.

[King Prout]

yes. and I'd have accepted their theoretical existence provisionally with as much grumbling and discomfort had I lived back then :)