Figure 8.32. A visual cue

Photograph of a sign used to encourage donation of blood among co-workers. It is titled 'Club Red,' and underneath the text reads 'Very Low' as an indication of the current blood supply.

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Figure 8.33. The gas gauge is another visual cue

Photograph of a gas gauge in an automobile on 'Empty.'

Source: Example courtesy of Duke Rohe, MD Anderson Cancer Center. Used with permission.

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