Imagine a series of conditions, where one can lead to the next, which could lead to the next. This could be any number of things, but let's use letters. If condition A has a 90% chance of leading to condition B, and condition B has a 90% chance of leading to condition C, and C has a 90% chance for D, and so on... up until K has a 90% chance for L, what does it mean? It's a common math issue that comes up in the real world, and it'd be easy to assume that A has a pretty high chance of leading to L. Unfortunately that's not true, and most of the time it doesn't. Because in order for L to happen, every single condition has to work right, and if even a single one fails, then it won't. This is a common issue in real life and is a "single point of failure". I've visualized this using a Scratch project and some random numbers. Click the green flag to try it out for yourself. Click it over and over again to run the simulation multiple times and see what you get. How often does A lead to L? Definitely not 90% of the time for me!
