Uncertainty principle
The more precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa.
--Heisenberg, uncertainty paper, 1927
Uncertainty principle: A principle of quantum mechanics (q.v.), according to which complete quantitative measurement of certain states and processes in terms of the usual space-time coordinates is impossible. Macroscopically negligible, the effect becomes of importance on the electronic scale. In particular, if simultaneous measurements of the position and the momentum of an electron are pressed beyond a certain degree of accuracy, it becomes impossible to increase the accuracy of either measurement except at the expense of a decrease in the accuracy of the other more exactly, if a is the uncertainty of the measurement of one of the coordinates of position of the electron and b is the uncertainty of the measurement of the corresponding component of momentum, the product ab (on principle) cannot be less than a certain constant h (namely Planck's constant, q.v.). On the basis that quantities in principle unobservable are not to be considered physically real, it is therefore held by quantum theorists that simultaneous ascription of an exact position and an exact momentum to an electron is memingless. This has been thought to have a bearing on, or to limit or modify the principle of determinism in physics.
Uncertainty is a fact of life. Uncertainty arises because of many reasons - incomplete knowledge about the reality, complexity, our limitation to predict future events, unforeseen major events etc.
Uncertainty surrounds every creature,every rock, every drop of rain, every spark of fire, it governs every single life, every single thread of dust, every single star,moon, sun. The more the uncertainty the higher the risks .The higher the risks the bigger the reward. Or not.Because it's uncertainty.
Uncertainty can be reduce by knowledge. Knowledge is power. Uncertainty is the thing that motivates one person or hinders the same person. It's one of the most powerful principles because it's a mixture of luck and knowledge.
In short it suggests that nobody shall never really know what is going on in the universe, much less control it. It asks the ear to bend to uncertainty, to negotiate with chance, not defiantly but with wit, grace and invention."