quantum mechanic

These creatures are not native to this universe; they seem
to have strangely derived powers, and unknown motives.
[]

_Uncertainty Principle_ The principle that it is not possible
to know with unlimited accuracy both the position and momentum
of a particle. ... An explanation of the uncertainty is that
in order to locate a particle exactly, an observer must be
able to bounce off it a photon of radiation; this act of
location itself alters the position of the particle
in an unpredictable way. To locate the position accurately,
photons of short wavelength would have to be used. The high
momentum of such photons would cause a large effect on the
position. On the other hand, using photons of lower momenta
would have less effect on the particle's position, but would
be less accurate because of the lower wavelength.
[ A Concise Dictionary of Physics ]

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