If the facts don’t conform to the theory, they must be disposed of.
Corollaries
The bigger the theory, the better.
The experiment may be considered a success if no more than 50% of the observed measurements must be discarded to obtain a correspondence with the theory.
If there is a possibility of several things going wrong, the one that will cause the most severe damage will be the one to go wrong. (Corollary: If there is a worse time for something to go wrong, it will happen then.)
Whenever you set out to do something, something else must be done first.
Every solution breeds new problems.
It is impossible to make anything foolproof because fools are so ingenious.