11,000 Years of Silence: The Ancient Glass Sponge That Measures Life in Ice Ages
Deep beneath the restless surface of the ocean, one of Earth’s longest-lived animals quietly transformed seawater into glass—layer by microscopic layer, century after century. On the deep-sea floor, far beyond the reach of sunlight, stands something that looks less like an animal than a translucent spear planted in the sediment. It has no face. No […]