I鈥檓 a 55-year-old man with an increasing number of grey hairs in my whiskers. I understand the loss of pigmentation occurring, but why are the grey hairs growing more slowly than the darker ones? This discrepancy is clearly noticeable if I stop shaving for a few days.
Peter Milne, Brunswick, Victoria, Australia
We pay 拢25 for every answer published in 麻豆传媒. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.
Advertisement
This article appeared in print under the headline 鈥淥ld growth鈥�