Okay kiddo, let me explain the Cabibbo angle in a simple way.
Imagine you are playing with two spinning tops, one bigger and one smaller. You can make them spin either by themselves or together, and when they're spinning, they're like little magnets that want to stick together or stay apart depending on how fast they're spinning.
The Cabibbo angle is like the amount of force that makes the smaller top want to stick to the bigger one when they're spinning together. It's named after an Italian physicist named Nicola Cabibbo who discovered this force in the 1960s.
In the world of physics, particles like protons and neutrons are made up of even smaller particles called quarks. And just like the spinning tops, these quarks can have different spins that create magnetic forces between them.
The Cabibbo angle is a way of describing how much this magnetic force affects quarks of different flavors, kind of like how the spinning tops can stick together depending on their size and speed.
It turns out that the Cabibbo angle is really important in understanding how these quarks interact with each other, and it's a key part of the theory known as the Standard Model of particle physics.
So there you have it, the Cabibbo angle is a force that helps explain how tiny spinning particles called quarks stick together, and it was discovered by a clever physicist named Nicola Cabibbo.