Taken me a bit of time to get around to posting this, blame the day job. But anyhoo, congratulations iaskew, you have won the first ever Certificate of Undying Appreciation. It will be winging it's way towards you tomorrow. I'm using your Spoke avatar as the background to your cherished certificate (which is a bit sad in your case). If you post a better looking avatar picture before lunch tomorrow you can have that instead.

I liked your answer the best. (the question was "I'm thinking of starting a company making time machines, how many do I have to make to ensure that everybody can have one?"). I think that zero is cheating. Once I'd made it I could go back and give it to myself - but I'd still have to make one.

I think the best answer is one machine. I'd just have to make sure that when any of my customers had finished with it they sent it back for use by the "next" one.