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Are There Any New Particles That We Haven't Discovered Yet?
The laws of physics, underlying our everyday lives, are completely understood. We can even say that there are no more particles or forces of nature that could possibly have an influence over your everyday life. If they were strong enough and noticeable enough to have such an influence, we would have seen them in experiments already. So it's very possible, in fact, overwhelmingly likely, that there are new particles and forces that we haven't discovered yet. But they are not the kinds that could possibly affect our biology or psychology or the stuff that we're walking on and seeing in our everyday experience.