How Does We're 99.9% sure this pattern is true Work?

We're 99.9% sure this pattern is true because we've seen it happen so many times that it's almost like it can't be wrong, but not completely sure, just really, really close.

Imagine you have a clock that ticks every second, and you watch it for a long time, days, weeks, even years. Every single time, the clock ticked exactly on time. You might think, “This clock is perfect!” But just because it has been ticking correctly for so long doesn’t mean it will never stop. It’s like saying, “I’ve seen this clock work 10,000 times, I’m almost sure it’ll keep working.”

That’s what 99.9% sure means, it's like being almost certain that your favorite toy will still work tomorrow, even though you’ve used it every day for a long time. It might break one day, but right now, the chance of that happening is really small, just 0.1%. That’s like saying there’s only a tiny sliver of doubt left.