When considering the impact of helmet size on brain protection, one thing is clear: increasing both time and distance is crucial for enhancing protection and reducing impact severity. A larger shell combined with a softer EPS (Expanded Polystyrene) provides more time and distance for the impact forces to be mitigated compared to a smaller, more compact shell with harder EPS. The duration of impact is closely related to the transfer of forces. With more time available to decelerate the body in motion, the resulting forces are lower. Time and motion are intertwined; a shorter stopping distance leads to higher forces, while a greater stopping distance reduces forces for objects of the same mass. Consider the classic engineering project involving building a box to protect an egg using energy management materials and dropping it from a rooftop. It becomes evident that smaller boxes, regardless of the materials used, often fail to safeguard the egg due to limited time and distance for impact mitigation.