A quiet northern forest hides a striking truth: fir trees can host tiny specks of gold within their needles. Near Finland’s Tiira deposit, researchers from the University of Oulu and the Geological Survey of Finland analyzed spruce canopies and found metallic nanoparticles where no one expected them. The gold sits inside the leaves, not dusted … Continue reading Neither myth nor fiction: Finland confirms that fir trees can attract gold to their needles thanks to invisible microbes.