  The goal of these talks was to explain how cohomology and other tools of
algebraic topology are seen through the lens of n-category theory. Special
topics include nonabelian cohomology, Postnikov towers, the theory of
"n-stuff", and n-categories for n = -1 and -2. The talks were very informal,
and so are these notes. A lengthy appendix clarifies certain puzzles and
ventures into deeper waters such as higher topos theory. For readers who want
more details, we include an annotated bibliography.
