That potentially shows the same phenomenon - kids given a Black History Month assignment to write a paper on a black inventor - and it's fairly clear there's some sort of automated threshold at work.
As evidence, I really doubt this difference is editorial-based:
As evidence, I really doubt this difference is editorial-based:
https://www.google.com/search?q=purple+musicians (shows the carousel)
https://www.google.com/search?q=purple+inventors (no carousel)