We noticed that github pages was serving incorrect responses to some members of our geographically dispersed team.
$ dig www.athena-institute.github.io +nostats +nocomments +nocmd
; <<>> DiG 9.8.3-P1 <<>> www.athena-institute.github.io +nostats
+nocomments +nocmd
;; global options: +cmd
;www.athena-institute.github.io. IN A