I always enjoy reading about how scientific notions, assumptions, and theorems can be challenged and sometimes disproved or updated.
Here's a case where the Faraday effect on light was shown to be affected by magnetic fields. It's a bit to digest, but the basic idea is that light that is polarized can be nudged by a magnet, in addition to electric fields (which was known).
And they sum it up thusly.
Finally, this work is tantalizing because it reminds us of one of the cornerstones of science – namely, that researchers may discover other as-yet unknown properties of light or other electromagnetic phenomena at any time, even in well-established models.
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