One of the most troubling paradoxes in the world of quantum physics is represented in the particle-wave duality, which implies that subatomic particles, or particles close to the quantum levels, exist in two different states at the same time – particle and wave.
Traditional particle-wave duality experiments, study the behavior or light aimed at solid plates, which have two parallel slits cut into the plate. As light or electrons are fired at the plate, they have only two possible choices, either go through the slit on the left, or the one on the right. Subatomic particles break this rule, by going through both slits at the same
Imagine a tennis ball thrown at a wall that has two separate windows. Then imagine the same ball passing through both windows at the same time. This is the paradox which the physicists are fighting with for over a century, you can’t have a single object in two places at once.
The weirdest thing of the particle duality is that it depends on the observer, and how much attention he/she will give to a certain event. If the observer concentrates on the slits, to detect through which one of them the particle will pass, it will observe that the particle will only pass through one of them, thus behaving like a particle. If it will concentrate on the effect produced after the particle has passed through the solid plate, it will discover that the interactions show that the particle has passed through both the slits at the same time, behaving like a wave.
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