At high energies all these particles behave similarly.

In quantum mechanics, particles also behave as waves with complex phases.

That's where two different particles separated by distances of miles can behave in exactly the same way.

In both cases, the particle behaves as a free particle outside of the barrier region.

Furthermore, he was able to determine that such particles behave as a dielectric medium.

Yet, the particles are always connected and can behave as one.

The way these particles behave with each other shows that there are four possible kinds of interactions: electromagnetic, strong, weak, and gravitational.

It corresponds to our classical intuition, and everyday experience, of how particles behave.

And the theory that describes how these particles behave is quantum theory.

But common sense says they cannot be both at once, since waves and particles behave very differently.