Twitter is a free service that lets you keep in touch with people through the exchange of quick, frequent answers to one simple question: What are you doing? Join today to start receiving billder's updates.
Already using Twitter from your phone? Click here.
Discussed the topology of belts this morning with @sisoma. Are upside down and inside out identical? Depends on the order of transformation.9:03 AM Dec 11thfrom twitterrific