Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
The Vatican's disruption of the Cairo population conference last week is a sign that it should in future enjoy the status of just another pressure group in relation to international negotiations.
Everybody knows that the situation for scientific researchers in the former Soviet Union is dire. But, in Russia at least, there is some reason for optimism.
Can a mathematical model of evolution dealing with species rather than their members as the substrate of natural selection accurately represent reality? Probably not, but it is suggestive and stimulating.
