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Re:Canal ice helps Dutch rediscover national identity by jws on Saturday January 17, 2009 @01:00PM (#438315)
... water pollution and ... have made [canal freezing] so rare...

What mechanism does water pollution have in freezing point depression? Surely they don't have enough dissolved solids to make a significant difference. A quick googling didn't reveal an easy answer. Perhaps this is "hacker knowledge".

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