Is the Universe Invariant?

In 19 56 an experiment was done on bata decay, which discovered that the universe is not invariant under paroty invers. The reason we understand this now is because nutrinos, which have momentum, they are spin-changing particles. So ats, that's basicout works. But i'll tell you one one little extra piece of sort of trever, in a sense, about emission of things from atoms. And so what you'll actually see is the nucleus will sort of self destructth one of its particles and transmuting it into something different.