Explore the intriguing connections between quaternions and fundamental physics in this thought-provoking talk from the "New trends in Quaternions and Octonions" workshop. Delve into topics such as fundamental constants, variable speed of light, and the Dirac equation. Examine the potential for eliminating free parameters in physics theories and investigate the concept of emergence. Gain insights into the Stern-Gerlach experiment and the notion of screwsense, all while considering how quaternions might reshape our understanding of the universe's fundamental laws.