Happy birthday, Dan! 40 today.

Dan is our 'Mission Impossible' coder. When we find out that a problem can't be solved, we give it to Dan. Sooner or later (usually sooner), Dan will come up with working code. Looking at this code will make us even more convinced that the problem can't be solved.

"That's all very well in practise, Dan," we'll say, "but it will never work in principle."