This week we're learning about the field of sociolinguistics: what it is, why it's important, and what it can tell us about our culture and our society. University of Toronto Professor Sali Tagliamonte helps us better understand the field, how her research is done, and how language changes over time in cultural and regional groups. And Dr. LeAnn Brown talks about how language cues reveal -- or more often fail to reveal -- gender and sexual preference.