Letter: For the record

Published 14 October 2015

• Our review of A Prehistory of the Cloud degraded slightly: JPEG image files commonly degrade when saved (5 September, p 45).

• A current of 1 amp is in fact 6.24150934×1018 electrons per second (3 October, p 38).

Issue no. 3043 published 17 October 2015

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