Wigner's classification

Alright kiddo, so there was this really smart dude named Eugene Wigner who loved math and science. He studied how particles like atoms and electrons behave, and he discovered that they can have different "personalities" or properties. He called these personalities "symmetries" because they describe how things look the same from different angles, like a snowflake.

Now, Wigner noticed that different particles have different symmetries, kind of like how people have different hair colors or eye shapes. And just like there are some things that only certain hair colors can do (like blondes might have lighter hair), there are some things that only particles with certain symmetries can do.

So Wigner came up with a way to organize all the different symmetries into groups, like a giant family tree. This is called Wigner's classification. It helps scientists understand how particles behave and how they interact with each other, kind of like how a family tree helps you understand how you're related to your cousins and grandparents.

Overall, Wigner's classification is a way to study the personalities of particles and put them into categories based on their symmetries, so we can better understand how they behave and interact with each other.