I agree, for melanoma that seems more plausible, and UV imaging of drivers faces commonly reveals large difference in UV skin damage on the driver side, althoug

I agree, for melanoma that seems more plausible, and UV imaging of drivers faces commonly reveals large difference in UV skin damage on the driver side, although this doesn't do much to explain the higher occurrence on the "trunk", unless either more people than I think like to drive naked, or melanoma is part localised to source of damage and part not? They also mention the UK at one point, and we drive on the opposite side, with the opposite side of the driver exposed. It's not clear from the article which countries are and are not included in the left side bias, I cannot find their sources. They also annoyingly skip over whether or not Japanese commonly sleep on their sides, because I suspect that could have a larger affect than any miniscule electromagnetic standing waves on some springs. If you've ever slept on a futon, you will know they are far less squishy, they are plenty comfortable, but do not deform as much, so you are more likely to end up sleeping on your back. Sleeping on your side could cause increased compression of soft tissue due to less equally distributed weight, especially on the hips and arms, which affects blood circulation, which can cause tissue damage, which can cause cancer (especially when the damage is chronic). ... but that's just a tiny seed of a theory, there are so many co factors with cancer, and comparing accross entirely different cultures it's basically impossible to tell anything from some correlation. Another huge area that massively affects cancer and pretty much all disease is diet, and the common western diet is far from healthy compared to Asian diets.