It is so obvious, so I decided to write about it.
Heisenberg principle came from quantum mechanics and means that you can't know exactly both coordinates and speed of particle. If you improve accuracy of detecting position, you lose accuracy in detecting speed and vice versa. Uncertain stuff.
In human-readable form it sounds like
Either one or the other
The same in every field, even in software engineering. If you implementing something or fixing bugs and your boss yelling: "you must work better and faster" tell him either one or the other.
P.S. Actually, you can say "go fuck yourself", but it won't be polite.mishadoff 21 February 2013