Which person goes into which branch of the military? The answer is related to the relative lengths of each person’s fingers, suggests this study by a researcher named Huh:
“Born to be a Marine: Digit ratios and military service,” HaengRyang Huh, Personality and Individual Differences, Volume 53, Issue 3, August 2012, Pages 166–168. The author, at Sejong University, Seoul, South Korea, explains:
“The current study tested the hypothesis that 2D:4D [the ratio of lengths of a person's second and fourth finger] would be associated with the type of military service chosen by young Korean males… Our research found evidence of small but significant group differences in 2D:4D among members of different branches of military service.
Huh also wrote the instant-classic study:
“Digit ratio and celebrity worship,” HaengRyang Huh, Personality and Individual Differences, Volume 52, Issue 3, February 2012, Pages 265–268. The author explains:
“Our research found evidence of a significant positive correlation between 2D:4D ratios and celebrity worship in females but not in males, which indicated that females with lower digit ratios were less likely to worship celebrities.
(Thanks to investigator Harry Ebb for bringing this to our attention.)