In this popular science talk by Emil Björnson, we take a look at the wireless evolution towards 6G and focus on mobile broadband applications, where the service quality is characterized by the data speed and traffic capacity. How much faster must wireless technology become and what are the real bottlenecks? The video discusses which factors determine the data speed and how those factors might be improved in the future, including which new innovative solutions are on the drawing table. Lessons from the past will be combined with visions for the future, to determine what we reasonably know about 6G.