Okay kiddo, let me tell you a story about something that happened a long time ago in 1843. A man named Sir William Rowan Hamilton was really into math. He was a smart man and had already made many important discoveries in his field.
One day, he was walking with his wife and they were crossing a bridge over a river. Suddenly, an idea popped into his head. It was an idea that would change math forever. He was so excited about his discovery that he took out a knife and carved it into the side of the bridge!
So what was this big idea? Well, Sir Hamilton had figured out a new way to represent numbers using a system called "quaternions." This allowed people to understand math in a different way and solve complex problems easier.
This was a big deal because for hundreds of years, people had been using a different system called "complex numbers" to solve math problems. But with Sir Hamilton's new discovery, everything changed.
Some people were upset about this though. They didn't want to learn a new way of doing things and were used to doing math the old way. This upset the traditional way of doing things and caused a lot of debate and disagreement.
But eventually, people realized how helpful Sir Hamilton's discovery was and it became widely adopted in the math world. This is why the disruption of 1843 was such a big deal and is still important today.