n=9 ...

https://royalsocietypublishing.org/doi/10.1098/rspb.2020.082...

9 might be okay if the effect size is large enough. (If the study was pre-registered there should have been a power analysis to determine the sample size given the hypothesized effect size.)

“Highly organized research is guaranteed to produce nothing new.”

― Frank Herbert, Dune

You mean like spam?

Duh. Get two.

The referenced report is much more informative https://www.brookings.edu/research/new-census-data-shows-the...