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The mystery of having the hands of a dead person

Raynaud syndrome causes your hands and feet to feel really cold and turn into white. It’s like when you see a dead person’s limbs in the movies. This happens when you feel cold, but you don’t need to feel too cold, just a little chilly. It seems some doctors ran some experiments to figure out how to improve this condition, such as cold exposure while keeping the hands warm (the Hamlet method) as described here: https://www.raynauds.org/2019/09/26/classical-conditioning-raynauds-therapy/ I’d like to know what can be the science behind this, if there is more evidence in this area and I also wonder whether breath work can improve this body behavior by generating more small vessels in the hands. Also, Wim Hof mentions that this can be improved by training your hand to resist cold temperatures gradually, which seems to be the opposite to the method proposed by Hamlet. Could this be possible?

Seawater and human skin

I’ve always thought seawater is good for human beings but I have no evidence of this. Is there any data regarding how seawater affects our body, our skin and our immune system? Can it be detrimental for our skin barrier and the bacteria living there?

Bruce Lee isometric workout routine

Is there any definitive science on isometric training that was popularized by Bruce Lee? I know there's controversy and very curious to find out!

Fear of heights

Any tips for someone who later in life has begun suffering from a fear of heights ..

migraines

What causes, prevents and treats migraines, and what are they and their variants, exactly.