Originally published at: https://bigideas.network/double-slit-experiment/
The double slit experiment is the most famous experiment in quantum mechanics.
It shows that quantum mechanical sized particles (e.g. particles that are even smaller than the protons and neutrons of an atom) can act with the properties of particles and waves at the same time. It’s pretty weird, because those two things are usually mutually exclusive.
But what the experiment really shows us is that when you look closely enough at the universe, it acts in strange and unfamiliar ways.