Theory is when you know everything but nothing works. Practice is when everything works but no one knows why. In our lab, theory and practice are combined: nothing works and no one knows why

The third one: "Theory is when you know everything but nothing works. Practice is when everything works but no one knows why. In our lab, theory and practice are combined: nothing works and no one knows why" is an example of logical reasoning that I highly recommend to anyone who wants to succeed in failing at whatever work or research he is trying to accomplish.

This saying starts by giving the definition of theory and practice from the point of view of someone who wants to prove himself right at all costs. Well it's rather a redefinition of these two terms so that each one becomes contradictory with the other, let's take look at it: if in your lab you have theory as defined above then there is at least one person who knows something since "you know everything" and thus you can't be using practice as defined above at the same time because in your practice "no one knows why". But since the person who has produced this genius saying works for an extraordinary lab he managed with his team to combine their theory and their practice so that they get the worst of each one: "nothing works and no one knows why".