Sisters Emily Robison and Martie Maguire and lead singer Natalie Maines all had babies during the hiatus.

NPR: Dixie Chicks Return, 'Taking the Long Way'

The notion was first proposed by Martie Haselton and David Buss, two of Dr Hill's colleagues, to explain a puzzling quirk in male psychology.

ECONOMIST: Flirting

Ms. MARTIE MAGUIRE (Musician, Dixie Chicks): What happened to us really drove us to make an album that said a lot, and I think people kind of linked into that because it was a story and it was something beyond the music.

NPR: 'Nice' Reward: Five Grammies for Dixie Chicks