Physicists fighting, and things we don't "get" yet

Back in May this year, I noted the fight that had broken out between physicists about whether the theory of cosmological inflation really made sense.

Finally, I see that Bee Hossenfelder has joined in, with two recent provocative posts in which she argues that some of the key claims about certain problems inflation allegedly solved were never problems in the first place.   Instead, it just became unthinkingly accepted amongst the physicist community that they must be problems.

She doesn't argue that inflation doesn't solve anything, but it's still pretty fascinating to see a well regarded physicist pointing out blind spots amongst her fellow scientists.

In other "gee, there's really a hell of a lot we don't understand yet" news, protons have been featuring lately.

First, there's a complete puzzle going on as to why different ways of measuring of the size of the proton keep giving incompatible results.   Nature covered it here.

Another report about it is here.  I can't find the report I most preferred, but I'll add it later if I do.

Secondly, as one J Soon has already tweeted, measurements of the proton and antiproton have shown they are very symmetrical, which seemingly removes one possible explanation of why matter came to dominate anti-matter in the universe.   The headline "the universe shouldn't exist" is a stretch, though.