[[File:Excerpt Regarding the HP Club.png|thumb|This excerpt, along with photos of a hat-sorting event, was retrieved from "The Replay, Yearbook of the Texas Academy of Mathematics and Science, 2011" (page 47) from the UNT digital library]] | [[File:Excerpt Regarding the HP Club.png|thumb|This excerpt, along with photos of a hat-sorting event, was retrieved from "The Replay, Yearbook of the Texas Academy of Mathematics and Science, 2011" (page 47) from the UNT digital library]] |