How on earth is Pluto not a planet?

Pluto’s not a planet anymore?
When did that happen? And why? Some mumbo jumbo about its “oblong orbit.” So, it’s a celestial free spirit that plays by its own rules—is that so wrong? I don’t recall Neptune complaining. I learned in school that there were nine planets. It was public school, and I was out sick a lot, but nine was the number. If I ever go on Jeopardy! and the number of planets comes up, I’m going to say, “What is nine, Alex.”