question$4$#$(2$ points$)$In the realm of civil engineering, theories form the bedrock upon which practical applications are built. Theoretical frameworks elucidate the behavior of structures under various conditions, guiding design principles and construction methodologies. They encompass structural analysis, fluid dynamics, soil mechanics, and more, offering predictive models and solutions to engineering challenges. Theoretical underpinnings aid in understanding the complexities of material properties, load distributions, and environmental impacts on infrastructure. From Euler's buckling theory to Navier$-$Stokes equations, these foundations empower engineers to innovate, optimize, and ensure the safety and resilience of the built environment. What are some pioneering theories in civil engineering that have revolutionized the field?