There have always been people who prefer trackballs to mice for controlling the screen pointer. Those with little room to swing a mouse, for example and, unaccountably, those controlling nuclear power stations, seem to have had a penchant for trackballs since they were first invented.
The trackball has advanced a lot since the early days, when close relations of snooker balls lumbered around in cradles with roller wheels used to detect movement. A lot of the advancements have come from companies like Kensington, and its new SlimBlade Trackball still has at least one innovation to add to the mix.
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