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...account for approximately 20% of older persons (United Nations Department of Economic and Social Affairs, 2013). So far in this course, the focus has been on the extent of ageing at the global level. It is important not to treat the world just as one whole – there are important differences between countries, and you will explore this in the next activity. Activity 2...

...accounts for this, and we assume that square B may appear slightly darker than it is, because it is cast in shadow. However, equally, our visual system is more alert to more obvious, hard-line changes in colour (as demonstrated by the checkerboard, where individual squares are easily picked out) and less so to gradual colour changes (as demonstrated by shadow). For these...