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A comment on The physics anomaly no one talks about: What’s up with those neutrinos?.

Re:The physics anomaly no one talks about: What’s up with th... by GOONIMMUNE on Monday September 20, 2021 @05:20PM (#28599149)
> Now, to be fair, neutrino-mixing in and by itself isn’t all that weird. Indeed, quarks also do this mixing, it’s just that they don’t mix as much. That *neutrinos mix is weird because neutrinos can only mix if they have masses. But we don’t know how they get masses.

Could someone explain to a layman why "neutrinos can only mix if they have masses"? Perhaps I don't understand what it means to "mix"

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Re:The physics anomaly no one talks about: What’s up with th... by LatteLazy on Tuesday September 21, 2021 @03:01PM (#28608548)
I believe...

Particles without mass are required to travel at the speed of light. Particles traveling at the speed of light don't experience time in their own frame of reference. For instance a photon is emitted and absorbed at the same instance from its point of view. So they have no time to do anything like change properties.

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