What killed the sea stars? Canadian researchers unlock 12-year-old mystery

At a downtown Toronto supermarket, Mary Brock stood over her cart, debating what not to buy. “Trump is causing a lot of trouble,” she told the Los Angeles Times in February. “I’d like to do my part.” And just like that, the shopper in the veggie section became the unlikely face of Canada’s resistance movement. That spring, Donald Trump was levying tariffs against Canada, threatening industries, workers, and consumers, and musing about erasing the border and making the country the “cherished” fifty-first US state. Residents north of the forty-ninth parallel responded by boycotting...