Bibliography (11):

1. Individual esthetic Preferences for Faces Are Shaped Mostly by Environments, Not Genes

2. Top 10 Replicated Findings From Behavioral Genetics § #7: The Environment Is Genetic

3. The nature and nurture of HEXACO personality trait differences: An extended twin family study

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Human_mating_strategies  :

      https://en.wikipedia.org/wiki/Human_mating_strategies

   2. https://en.wikipedia.org/wiki/Twin#Monozygotic_(identical)_twins  :

      https://en.wikipedia.org/wiki/Twin#Monozygotic_(identical)_twins

   3. Variance

   4. Confounding

   5. Statistical-significance

   6. Statistical power

   7. https://en.wikipedia.org/wiki/Attachment_theory  :

      https://en.wikipedia.org/wiki/Attachment_theory

   8. Observational error