Next time you are on a long haul flight, take a good look at your 300 or so fellow passengers. Without doubt they will differ in all sorts of ways: some will be tall and some will be short. Some will be thin, and some, probably those in the seat next to yours, will be very large indeed. It is not only their physical characteristics which will differ. Their personalities will vary too. Jobs differ too. The cabin staff need qualities to enable them to deal with demanding passengers. The navigator needs precise spatial reasoning. It is clear that selecting the right person for some jobs can be literally a matter of life or death.
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