By Ayurella Horn-Muller, CNN
Scientists have made a groundbreaking discovery that the Great Wall of China is being protected by a "living skin." This natural layer, known as biocrusts, acts as a shield, preserving the ancient structure from erosion and damage. The biocrusts, formed by various organisms like mosses and lichens, contribute to the wall's strength and resilience. This revelation sheds new light on the remarkable ways nature can safeguard man-made wonders.