反馈：熊的计量单位与论文撤稿的奇闻

A shedload of bears Twisteddoodles for New Scientist Following the use of golden retrievers as a unit of ice mass, Feedback has found our inbox filling up with more examples of unconventional and often unintuitive units of measurement. Craig Downing, who self-identifies as “one of those readers that opens every issue from the back” and therefore gets top billing in this column, tells us of the Rideau canal running through his home city of Ottawa, Canada. The canal freezes every winter, becoming the world’s largest skating rink by area. However, the rink must be meticulously cleared of snow to ensure a smooth surface. Hence the statement by the canal’s managers, the National Capital Commission, that Craig was emailed. …