Lodestone is a naturally magnetized piece of the mineral magnetite
Light, being both a wave and a particle, displays many properties similar to both of them. Light, like waves, travels at different speeds through mediums because they provide any variable amount of resistance. Even air resists light to a degree, and light speed through air is slower than light speed in a vacuum.
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And so calculating we get the maximum speed at each proton will reach To be 1.36 Times 10 to the four m the second