But where, exactly, are the greatest concentrations of poor people?
And Britain has some of the world's greatest concentrations of social scientists.
This map shows some of the greatest concentrations of new arrivals by country.
The greatest concentrations were in Norwich, and the pollution extended as far west as Birmingham.
Blacknose, bonnethead and hammerhead sharks contained the greatest concentrations.
The greatest concentrations are in Southeast Asia, where most engage in commercial activities or run plantations.
The greatest concentrations of plankton are found in the North Atlantic.
But for me the island's chief attractions were its prehistoric sites -- over a thousand of them, one of the greatest concentrations in the world.
The modern visitor gets one of the world's greatest concentrations of artefacts and art, spread across several museums, but there's a lot more besides.
Neville's techniques could also be applied with chilling effects in a country like China, which has one of the greatest concentrations of CCTV surveillance outside the United Kingdom.
By early morning, when the galleries open, wander over to Canyon Road, which has one of the greatest concentrations of art spaces west of the Hudson.
