The story starts with quantum field theory, which is incredibly complex, but the simplified version is that even empty space is filled with fields that could govern the interactions of any quantum objects in or near that space. You can think of different particles as energetic excitements of these fields—so a photon is simply an energetic state of the quantum field.
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As a beginner, I expected the arms and hands to flail around, knocking the blocks and cups around the room.
圖像來源，BBC CHINESE/ TING CHIANG