永利总站手机网址:The thing about beards


This is a classic article from New Scientist’s archive, republished as part of our 50th anniversary celebrations SOME time during the next few months Gillette will embark on an expensive advertising campaign promoting a new shaving device. Science actually played a role in this marketing gesture – Gillette says that its new razor was developed after Dr Norman Welsh discovered “beard hysteresis”. As a razor blade cuts a bristle it also pulls the hair out of its follicle. The hair soon retreats back into the skin,
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