 With Cass Sunstein, Tali Sharratt is the co-author of the book, Look Again, The Power of Noticing What Was Always There. Tali, so far we've talked mostly about the ways we habituate to positive things, but of course the mind also habituates to negative things. In 1999, a huge public works project in Massachusetts was wrapping up. It had taken a decade to complete. All that remained was to open an underwater tunnel. I want to play you a public television news clip about what happened that day.