An electrified comb that reportedly regrows hair in a month

Researchers at Beihang University have built a device called "Detangle" that looks like a comb and passes electrical stimulation through the scalp. According to the study, described in Nature Communications, it regrew hair on balding skin within a month. The summary we have gives no details on who or what it was tested on, so treat the headline result with caution. Still, a hair-loss treatment that resembles something from a bathroom drawer, rather than a pill or a surgical procedure, is an appealing idea.