快猫短视频

How do metal blades in wet shavers lose their sharpness so easily on human hair and how can I avoid this?

Graham Thompson, Cumbria, UK

We pay 拢25 for every answer published in 快猫短视频. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淟et鈥檚 be blunt鈥�