2. http://www.thesundaytimes.co.uk/sto/news/uk_news/Education/article1165099.ece
3. Single artificial light source
4. This picture is one that has become iconic to my generation. In the past a single artificial light source was a soft candle. However, now possibly the most common single artificial light source would have to be a laptop screen. The proximity of the laptop to our faces creates a real hard white light and can be very damaging to our eyes but we still do it anyway.
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