It’s true, those little bits of plastic can now tell if you are lying! OK, well not quite the little blocks but some clever people have built a lie detector sensor to attach to the LEGO Mindstorm unit. I found out about it through the Engadget article here.
It is fairly basic in the sense that it is simply made from some aluminium foil and then they record the resistance changes as the body reacts to something, e.g. a question!
I think its a genius idea as it is pretty cute idea because of its sheer simplicity