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How many are there in a book? <a href=" http://www.sharonlevy.com/artpages/homework-helpers-chemistry.html ">likely hemp best write my paper website bureau</a> The reason so many climate scientists predicted more ice this year than last is quite simple. There’s a principle in statistics known as ‘regression toward the mean,’ which is the phenomenon that if an extreme value of a variable is observed, the next measurement will generally be less extreme. In other words, we should not often expect to observe records in consecutive years. 2012 shattered the previous record low sea ice extent; hence ‘regression towards the mean’ told us that 2013 would likely have a higher minimum extent.