Werner Heisenberg (1901–1976)
was a German theoretical physicist and Nobel laureate,
one of the founders of quantum mechanics.
 
He formulated the "Uncertainty Principle" (developed in an essay published in 1927)

It states that :
Certain pairs of observables of a single elementary particle
are immeasurable (with arbitrary precision).
The most familiar of these is the position and the momentum.

Heisenberg showed that
No physical phenomenon can be described
as a "classic point particle"  or  as a wave,
but more as a wave-particle duality,
in which matter is only "fixed" when observing / measuring it.

ie. Observation changes the nature of the Observed.

and,
 
that since the precise position and momentum (motion) of a particle
cannot be known at a given instant,
its future cannot be determined.!
                                                                                                                                                                                   
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