In fact very much research scientists are trying to uncover how the behavior of atoms, particles and quantum.

But there is one experiment that I find most interesting and the simplest to discuss is a double slit experiment by Thomas Young.

This physics experiment was originally intended to know whether the light was a particle or a wave?

You need to know here that the particles are "creatures" that are completely different from the waves. Particles can be defined as "small clumps of essence".

While the waves are "formless disorders that can spread and scatter everywhere". Logically it is impossible that something is both. How could something be in a certain coordinate but at the same time spreading and being everywhere? That's the question of scientists at that time.