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.
Disappointment with the draft global warming treaty agreed last week in New York should not get out of hand. What the world needs is a comprehensive deal and a lasting one. Last week was a good start.
The report of the US National Institutes of Health is not so much a finding as a series of findings on the research that led to the discovery of the AIDS virus.