sentences:  Ben Goldacre has observed that the equations "fail even to make mathematical sense on their own terms", pointing out that under Arnall's original equation, packing for ten hours and preparing for 40 will always guarantee a good holiday, and that "you can have an infinitely good weekend by staying at home and cutting your travel time to zero".Dean Burnett, a neuroscientist who has worked in the psychology department of Cardiff University, has described the work as "farcical", with "nonsensical measurements".Arnall also says, in a press release commissioned by Wall's, that he has calculated the happiest day of the year – in 2005, 24 June, in 2006, 23 June, in 2007, 20 June and in 2010, 18 June.