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...adults and up to 7 mm in younger people, increasing the amount of light entering the eye by a factor of approximately ten times. The expansion of the pupil takes place quite rapidly – typically in a few seconds. If you remain in dark conditions for long enough a second, slower change takes place, this time in the retina, which is the light-sensitive surface inside your...

...care workers involved in controlling epidemics...Vaccination: 6.3 Asymptomatic carriers - A related problem for disease eradication is seen in some human infectious diseases, where a carrier state develops. One example is typhoid, where 2–5 per cent of individuals become chronically infected, but without any symptoms of the disease. They excrete the typhoid bacteria...

...Adult Smoking Habits in Great Britain: 2014 [Online], Newport, Office for National Statistics. Available at www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/healthandlifeexpectancies/bulletins/adultsmokinghabitsingreatbritain/2014 (Accessed 18 September 2016). Oxford English Dictionary (2016) [Online], Oxford, Oxford University Press. Available at...