Thread:Blue Luna/@comment-29401477-20170601092915/@comment-25047329-20170601121029

It might be a dialect thing. I think most of the native English speakers on this site are American.

I did a quick check to verify and the grammatical rules that I've found say it's unnecessary. I've heard it used both ways, but I think the omission of "and" is more formal. It might be one of those cases where it's become common in everyday speech to say something a certain way, but it's technically incorrect. Maybe as far as American grammar is concerned anyway.