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Slider at the bottom controls what you see... you start with seeing
all elements filtered to the predominant revisit rate. If you move the right
slider to the left you are basically saying you don't want things that
never change. The further you move it to the left, you require the
document to change more often (range is in the title of the window
displayed in seconds). If you leave the right slider all the way on
the right, and start moving the left one you get things that change.