The Unsolved problems in physics reference article from the English Wikipedia on 24-Jul-2004
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Unsolved problems in physics

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The following are some of the unsolved problems in physics. This is an incomplete list of outstanding problems in physics. Some of these problems are theoretical, meaning that existing theories seem incapable of explaining some observed phenomenon or experimental result. Others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.

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