See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. In the frigid landscapes of northern Norway, an unusual phenomenon ...

Blue growth rings found in woody plant stems represent years when cells did not lignify properly because of summers too cold for growth When the going gets cold, even tough trees struggle with growing ...

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth don't lignify properly, creating blue rings that appear when wood samples ...