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.
In Milan, athletes showed that patriotism can be generous. In Los Angeles, that definition will be tested on the biggest, loudest stage sport can offer
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Юлия Сычева (корреспондент)
朝鲜劳动党总书记金正恩在阅兵式上发表讲话说，朝鲜军队已为应对任何情况做好准备。对于任何侵犯国家主权和安全利益的军事敌对行为，朝方将立即进行报复性打击。