Small World is a blog about nanotechnology funded by Nanopinion, a European Commission project. All the posts are commissioned by the Guardian, which has editorial control over the

blog's contents. The views expressed are those of the authors and do not engage or commit the European Commission in any way. The community is not liable for any use that may be made of

the information contained therein. Nanopinion is funded under the EC contract FP7 NMP4-CA-2012-290575