Mathematical foundations of quantum mechanics make the unorthodox assumption that, in the interaction of electromagnetic radiation with matter, energy can only be exchanged in discrete units called quanta.
Explaining certain features of the photoelectric effect by assuming that energy quanta are actual particles, dubbed photons.
To feel this transparent light, the dance between darkness and light will always remain, as someone once said — the stars and the moon will always need the darkness to be seen, the darkness will just not be worth having without the moon, the planets and the stars.
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