"Things You Wouldn't Know If We Didn't Blog Intermittently."
Labov is the best. Clips like these should be compulsory material for anyone who complains about the supposed "decay" of their language. No, it's evolution happening right before our eyes; that's what living languages do, and have been doing for thousands of years. There is no principal difference between this particular vowel shift and the one that happened during the late Middle Ages.