Some of the pages have slide shows on them, for example the step by step weathering guides. These will automatically show the next slide after a period of time. However there are ways you can prevent and override this.
If you place you mouse over the slide being shown then it will not proceed to the next slide, but rather pause on the slide currently being shown. In addition some navigation arrows will appear that allow you to move to the next slide or the previous slide.
You will also see that there are a series of dots under the slide, one of these will be highlighted, this represents the current slide in the sequence. You may click on the dots to move to the slide represented by the dot.
Moving your mouse off the slide content will allow it to once again automatically move through the sequence.