In the long human effort to venture beyond Earth, engineers have often found their most elegant solutions not in laboratories but in the living world. Researchers are now studying the architecture of eggshells — nature's own lightweight armor — as a blueprint for spacecraft shielding capable of withstanding micrometeorites, thermal extremes, and the slow attrition of solar radiation. The insight is ancient in its logic: that form refined over millions of years of biological pressure may outperform form designed over decades of engineering iteration. If the work succeeds, the shells that once p