Explore a comprehensive lecture on Boson droplets near the unitary limit, delivered by Mario Gattobigio from Côte d'Azur University as part of the Opportunities and Challenges in Few-Body Physics conference at KITP. Delve into topics such as the freebody parameter, effective range expansion, binding energy, and echo potential. Gain insights into the calculations, family of parameters, and free body force involved in this area of few-body physics. Learn about the interdisciplinary nature of the field, connecting atomic and nuclear physics through concepts like the three-body Efimov effect. Understand the importance of universality and its organizing principles in various branches of physics, including nuclear, atomic, molecular, condensed matter, high-energy, and mathematical physics.