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If I remember correctly, some people say that light/photons are massless,
So this got me thinking about other massless "things" such as gravity, time, and the thoughts in my mind.
But light...if light really is massless, we shouldn't be able to see it,
so what effect from the photons are we seeing that causes "light"?
I mean, we can't destroy gravity or time nor can we manipulate it (not to my knowledge anyways).