When women told me they'd always wished they had a sister, they were thinking of this ideal of mutual encouragement and support. Many of those who have sisters also yearn for this ideal because their relationships with their sisters don't always live up to it.

As a sociolinguist, I want to know how cultural differences affect the ways people talk and listen. My research method, inspired by the work of Robin Lakoff and John Gumperz of the University of California at Berkeley, is sociolinguistic microanalysis. I tape-record and transcribe naturally occurring conversations.

The political Right is particularly vehement when it comes to compromise. Conservatives are now strongly swayed by the Tea Party movement, whose clarion call is a refusal to compromise regardless of the practical consequences.

I think it is important to remember that there are so many different ways to be sisters.

The word 'sister' evokes an ideal of connection and support, like the friendships that made Rebecca Wells's 'Divine Secrets of the Ya-Ya Sisterhood' and Ann Brashares's 'The Sisterhood of the Traveling Pants' into best-selling novels and successful films.