Data from molecular genetics have changed our views on the origin, spread and timescale of our species across this planet. But how can we reveal more detail about the demography of ancient human populations? For example, is it possible to determine when and how many people arrived at a certain continent, and which route they took from a choice of geographically plausible options? One of the most promising tools for such investigation is computer simulation incorporating various demographic scenarios. The simulation outcomes must be evaluated by teams with archaeological expertise, since...

All cities are vulnerable. They have economically, socially, institutionally vulnerable urban space.

In developing countries, vulnerable urban space can be observed typically as substandard informal settlements such as slums or areas occupied by squatters. At present, slum dwellers comprise one-third of the world's urban population of 3 billion, and it has been estimated that the number of slum dwellers will double in the next 30 years if no effective action is taken. Improvement of vulnerable urban areas, which is one of the targets of Millennium Development Goals, is thus an...