Corey and Steve, friends for almost 30 years, introduce each other to the audience.

Caltech Traditions and Pranks
http://www.admissions.caltech.edu/exp...

Steve’s blog, Information Processing
http://infoproc.blogspot.com

man·i·fold  /ˈmanəˌfōld/   many and various.

In mathematics, a manifold is a topological space that locally
resembles Euclidean space near each point.