Is it witchcraft? Seems like witchcraft.
In: Technology
multiple ways. your phone has an accelerometer in it. walking produces very distinct acceleration graphs https://www.researchgate.net/figure/Acceleration-along-the-Y-Axis-Walking-vs-Riding-a-Bus_fig1_297659886
it also knows its position, and therefore its speed. walking is slower than other forms of transportation.
All that being said, phones are magic. if you dig into what any phone truly is, it is a specially grown silicon crystal (created using sunlight and alchemy) embedded in a specific copper rune that uses tame lightning to think. (all of this is true, this is not a joke) Its just a corollary of clark’s 3rd law, any sufficiently explained magic is indistinguishable from technology
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