The ongoing digitisation and analysis of the Gilgit Manuscript cache have yielded an extraordinary find: a series of 8th-century birch-bark fragments containing lost Sanskrit theorems on fluid mechanics. Using an AI-based linguistic reconstruction model, scholars have identified detailed descriptions of 'Sandra-Gati'—a term the text uses to describe viscosity—and how different liquids respond to 'Kshobha' or shear stress when passed through conduits of varying diameters.
The treatise outlines experimental observations on the flow of water, oils, and mercury, proposing that the resistance to flow is proportional to the 'thickness' of the fluid. This represents the earliest known systematic investigation of fluid dynamics in the Indian subcontinent. Historians believe these texts were likely used by ancient engineers to design the complex, gravity-fed irrigation and water-cooling systems found in the mountain fortresses of the Hindu Kush during the early medieval period.