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Letter: For the record

Published 29 April 2009

• The arxiv URL in our article on internet surveillance should have been (4 April, p 17).

• The figure of 3400 road fatalities per month in the US is for overall road accident deaths, not just pedestrian deaths (18 April, p 18).

Issue no. 2706 published 2 May 2009

Â鶹´«Ã½ issue 2706 cover

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