This is a classic article from Â鶹´«Ã½’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, but it takes about an eighth of a second to do this. Dr Welsh…
