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From Simon Shaw, University of Durham

So, the Universe is 3.7 days old is it (“Gamma force”, 3 July, p 43)?

Several readers have pointed out the mistake on p 43 of the 3 July issue.
1015 years should have read 10¹⁵ ²â±ð²¹°ù²õâ€Ì§»å

Durham