These “blue rings,” visible only under a microscope ... Each ring represents one year of the tree’s life, with the width and color of the rings reflecting the tree’s growth conditions that year. Wider ...

Taken from a tree in Norway, this stained tree sample shows a blue ring from 1902. (Credit: Pawel Matulewski and Liliana Siekacz) Human skin isn't the only thing that can change color after facing the ...

Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the weather of the past by looking at tree rings — which can tell us far more than just the trees’ age. ‘Blue’ ...

If you're growing hydrangeas in your yard, you probably already know that you can alter the color ... tree, you might be wondering whether this is causing your hydrangea blooms to stay blue ...