'My butter seems harder': spread sparks furore over Canada's dairy industry

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It began with an innocent question on Twitter: was butter in Canada becoming more difficult to spread?

My butter just seemed harder. It was during a very hot period and I noticed it wasn't behaving right," said Sylvain Charlebois, a professor of food distribution and policy at Dalhousie University who posted the tweet. But I thought I was the only one experiencing this."