Damn closed email accounts! The domain registration for Subtraction.com expired recently and I almost didn’t even reallize it — I had used a now-defunct email address as the main contact address and had totally forgotten that the term was expiring, so my registrar was unable to reach me. The Internet really needs a reliable forwarding service. In any event, my apologies for the errors when surfing or emailing to Subtraction.com over the past few days. Everything should be back to normal now.