The word "stuck" can imply many things including capillary action, partial vacuum (suction), and magnetism. Obviously, these people are referring to magnetism, not anything else. Using pepper in copper lines is an old trick to remove or 'dam-up' the remaining water to solder leaks in the line. Critical thinking is verifying the experiment yourself. I recently watched a video of a doctor's office verifying this himself. According to your armchair judgment this medical doctor knows less than you. I disagree.
Can u share that vid fren?
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