Recent advances in experimental measurements and numerical simulations has allowed us to discover new phenomena in multiphase turbulence (a flow regime characterized by chaotic and irregular motion in the presence of immersed surfaces/bodies). In this talk, I will discuss some of these new discoveries and their importance both from a fundamental and an application viewpoint. I will first present our finding of a surprising fluctuation-induced force between two plates immersed in a turbulent fluid. The mechanism of force generation reveals an intriguing analogy with the quantum Casimir effect. Next, I will discuss how multiscale interactions between immersed bodies/surfaces and a carrier turbulent fluid can lead to drag reduction in the context of Taylor-Couette flows. I will conclude by showing some recent advances in our understanding of the role of turbulence in bio-physical flows (e.g. Cardio-vascular flow).