A dialogue box which shows in the panel at the top ‘Messages’ ‘Mom’ and ‘Edit’. Below this are a series of speech bubbles. The first reads ‘Taking vitamin A can reduce the risk of poor vision in individuals with a vitamin deficiency.’ The second reads ‘What’s the evidence for that?’, followed by two other speech bubbles with the text ‘(a) A paper published in 2003 by researchers at Brigham and Women’s Hospital (…)’ and ‘OR (b) In 1998, researchers at Johns Hopkins and Nepal Eye Hospital Complex (…)’. At the bottom is a ‘Send’ button.