When Burl Ives sang "Silver and gold decorations, on every Christmas tree" in "Rudolph the Red-nosed Reindeer," he surely didn't know that Christmas trees actually have gold inside their needles — but that's exactly what new research has found.
A study published Aug. 28 in the journal Environmental Microbiome reports that Norway spruce trees (Picea abies) concentrate gold nanoparticles with the help of their resident bacteria.
