The brain that refuses to sleep is the same brain that ponders fundamental physics at 3 AM. Photons, the particles of light, indeed have no rest mass—that's why they can travel at the universal speed limit of 299,792,458 m/s. They're essentially the universe's way of saying "I travel light because I literally am light." This is the kind of thought that keeps physicists awake and everyone else wishing their brain came with an off switch.
Light Always Travels Light

physics-memes, photons-memes, insomnia-memes, brain-memes, light-memes | ScienceHumor.io
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