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Letter: For the record

Published 26 August 2009

• The DOI for Steven Clapcote’s paper on epileptic mice (8 August, p 14) is .

• The Planck length – the quantum of distance – is 1.6 × 10-35 metres, not “about 10-33 metres” (15 August, p 26).

Issue no. 2723 published 29 August 2009

Â鶹´«Ã½ issue 2723 cover

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