In the world of quantum mechanics, particles behave in discreet ways. One breakthrough experiment was the Stern-Gerlach Experiment, performed in 1922. They passed silver atoms through a magnetic field and watched how the spin of the atoms caused the particles to deflect in a very specific way.
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The Stern-Gerlach experiment has fascinating implications. I have explored them in considerable technical depth in the following articles:
http://scripturalphysics.org/qm/qmconcpt.htm#OriginOfIntrinsicSpin
Correct the word “discreet” to “discrete” (which gives the correct meaning – separate, distinct)