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In this scene, Charlie explains how the drops of water coming from a sprinkler can be used to extrapolate the sprinkler's location. He then explains how, by modeling what the previous crime scenes have in common, they can determine the killer's home.

In this scene, Charlie and Don are trying to come up with equations for finding the killer's home location. Using what Don knows about crime, Charlie then makes equations to reflect this.

In this scence, Charlie explains how he used statistical modeling to develop a heatmap of where the killer's home most likely is. He then illustrates how the killer's crime scenes seem randomly distributed, but are not.

In this scene, Charlie and Don realize that their mathematical model is wrong because they were focusing on the wrong factor (the home) as opposed to the right one (the criminal's workplace).

In this scene, Charlie writes a series of mathematical expressions that will be used to find the killer's home taking into account his behavior, proximity, etc.

In this scene, Charlie explains how he checked the equations he's using to catch the killer by going backwards from his results and making sure he gets the same answer. Because he doesn't, he realizes that either one of his expressions or the data he was given is wrong.

In this scene, Charlie explains sabermetrics (the math of baseball) to one of his colleagues and explains that he will have to figure out what each part of the expression means.

In this clip, Charlie explains how the blackmailer re-engineered the Shiryaev-Roberts Changepoint Detection Procudure (used to find points of change in data) to find evidence of steroid use.