It’s Monday morning, the start of your work week. You've put the finishing touches on that big report, prepared for that imminent presentation. But it's likely that there's one aspect of the job ...

I settled into a salon chair at Head Spa Nagomi while my practitioner, Kai Fujimoto, wove a tiny digital camera through my wet hair. It provided a 230-times-magnified view of my scalp on a nearby ...