No ideas but in BLOGS
This reminds me of the mystery of the Frozen Thames which apparently froze over 40 times in recorded history. Helen Humphreys has a gorgeous book about it. What was it that made the Thames freeze over? http://lemonhound.blogspot.com/2008/03/helen-humphreys.htmlApparently, aside from the mini ice-age etc, it was the narrowing of the river at--I believe the London Bridge. I'll have to check on that when I get home tonight. When they rebuilt the bridge the river stopped freezing over. That last time being, if I recall, a 100 years ago now.
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