指甲生长。35年的观察。

Arch Intern Med. 1980 Jan;140(1):73-6. doi: 10.1001/archinte.140.1.73.

A 35-year observation of the growth of my nails indicates the slowing of growth with increasing age. The average daily growth of the left thumbnail, for instance, has varied from 0.123 mm a day during the first part of the study when 1 was 32 years of age to 0.095 mm a day at the age of 67.

对我指甲生长情况进行的35年观察表明，指甲生长速度会随着年龄增长而减缓。例如，左拇指指甲的日均生长长度，在研究初期我32岁时为每天0.123毫米，到67岁时降至每天0.095毫米。