: Seminal papers like "The Neglected 95%: Why American Psychology Needs to Become Less American" by Jeffrey Arnett argue that US-centric research (which often focuses on the "US" experience) fails to represent the broader human population.
Research into the early United States frequently highlights the recurring use of the number 13 as a symbol of unity among the original colonies: 13. Us
: A famous 2015 study attempted to replicate 100 psychology experiments, finding that only about one-third produced significant results, often with effect sizes half as strong as the originals. : Seminal papers like "The Neglected 95%: Why
: Modern social studies curricula, such as those in Louisiana , use "13" as a primary framework for teaching the founding principles, including economic terms like free enterprise and private property. Psychology and Research Contexts Psychology and Research Contexts : Legal research often
: Legal research often examines the 13th Amendment , which solidified the end of slavery in the US, as a "solid ground" for modern civil rights analysis.
: The design features 13 arrows, 13 olive leaves, and 13 letters in the motto E Pluribus Unum . Official explanations from the National Archives and Wikipedia note these represent the "solid compact" of the several states.