"Denizens of lower-gravity planets like Mercury historically have had trouble adjusting to life on other planets. Mercurians, with their lower bone density (left) would typically shatter their femur within a week on heavier planets. Members of asteroid-rigged flotillas and colony ships have similar issues when arriving home from space. The invention of Kinetic Dispersion Rings (above) help alleviate the stress of heavier-than-normal gravity by converting kinetic energy into heat, sound, and light. Settlers from Mercury could finally leave their home planet in safety." -Mercurian History Museum