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Pupillometry uses pupil diameter as a physiological measure of cognitive effort and load. In static tasks, pupillometry hasrevealed that cognitive effort varies with expertise, and, combined with gaze analysis, shows that experts can exert effort tofocus on non-salient visual input. Much real-life expertise is practiced in dynamic tasks, and expert effort in dynamic tasksremains unstudied. Using tetris as a dynamic task environment, we collected pupil and gameplay data from individuals ofvarying expertise levels. We then use collected data and examine cognitive workload differences across levels of expertise.Consistent with studies of image saliency and gaze, our results indicate that experts and novices engage differently withthe task and do not experience the same cognitive workload. Further inspection will likely reveal strategy-level sources ofthese differences.

According to special relativity, a (longitudinally) moving stick is Lorentz contracted. When it is brought to rest, it must expand to its proper length. But, exactly how this expansion unfolds depends on how the stick is stopped. If the front end hits a brick wall, the rear end must (briefly) continue moving, and the stick contracts even further before expanding; if instead the rear end is suddenly stopped, the front end (briefly) continues, and (surprisingly) the stick overexpands before settling into its proper length. These effects of overexpanding and overcontracting are independent of any classical or molecular elasticity, but are derived entirely from the limits of information travel time imposed by special relativity. I explore these phenomena, inspired by the little known 'lock and key' paradox. [DOI: 10.1119/1.2711827]