• There was an error in the graphic showing predicted evolution of our galaxy (16 July, p 33). The small image marked “125 million years in the future” copied the present position, and succeeding images were out by 125 million years.
• SpaceShipOne flew to an altitude of 100,000 metres, not 30,000 as we said on 6 August, p 23.
• The cute big cats in the photo on 13 August, p 41, were snow leopards, not cheetahs as stated.
• Many Canadians have been quick to remind us that, with the exception of Lake Michigan, the Great Lakes are not just part of the US (20 August, p 18), but are part of both the US and Canada and jointly managed by both governments.
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• Unlike Einstein’s luck, our concentration ran out while we were proof-reading the cover for the 20 August issue. As a number of readers have pointedly reminded us, the first “What if?” line should have read “Einstein’s luck had run out”.
