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'Unmeltable' snowballs explained

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We've seen a lot of snow over the last few weeks in both the U.S. and Canada.  But snow that doesn't melt when held to a blowtorch or lighter? Videos of this strange phenomenon went viral last week.


However, as Johanna  Wagstaffe explains in this week's Science Smart, there's a perfectly reasonable explanation. 


If you have a science question you'd like answered, send Johanna Wagstaffe a tweet (@JWagstaffe) or an email to Johanna.Wagstaffe@CBC.ca.


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