Scientists have unearthed the remnants of more than 1,700 viruses from deep inside a glacier in western China. Most of these viruses are new to science.

With this discovery, the number of ancient viruses recovered from glaciers has grown fiftyfold.The viruses, gathered from a 1,000-foot ice core taken from the sprawling Guliya Glacier on the Tibetan Plateau, date back 41,000 years and span three major shifts from cold to warm.