I'm curious if anyone knows whether its safe to put a strong EM field so close to your brain, so often — evidence one way or the other. I use a battery powered clipper, in hopes it would have a weaker field than one powered by 120VAC.
As a physics smell test, TMS seems to be performed using quickly releasing a capacitor to create a 1-10 (order of magnitude) Tesla magnetic field over a very short period of time. 10T is similar to the magnetic field generated by an MRI. For comparison, a toaster produces a 100 nano-Tesla field, about 7 orders of magnitude smaller. So supposing TMS causes real effect, the clippers are so weak in comparison that I would think they are harmless.
In terms of electricity, which people have more intuition about, 7 orders of magnitude is the difference between a studio camera flash and a lightning strike
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This is a good comment, but I think it's worth emphasizing that this is the difference between "7 orders of magnitude" and "6 orders of magnitude". It doesn't in any way invalidate the point in the comment it is replying to.
Consider learning to cut your own hair with scissors if your hair type allows it.
I've done haircuts for myself for 15 years with only a pair of thinning scissors. I have never once used a clipper. I'm Asian with straight hair so this is possible. The sides and back are hard at first but thinning scissors make the cutting very mistake-tolerant. You can cut at any angle, roughly around the place that needs it, and it cuts some layers of hair off. You just repeat cutting and feeling the length with your hands and eventually it'll be at the right length. It takes me about 30-45 minutes including everything from cutting, showering after, vacuuming and clean up. I only recent stopped (and went back to a barber shop), only because I have a baby now and I really need every bit of energy and time I can get back in my life.
