From Ken Green
I read your story on identifying people using “soft” biometrics, such as ear shape (30 November, p 22). I have long regarded gait as a surefire identifier.
Many people found my identical twin sisters hard to distinguish. The only time I had difficulty was when they were at a distance, but it only required one of them to stand or walk away and they were instantly recognisable.
Frankly, I doubt there are any more personal characteristics than the manner in which we bear ourselves, walk, run, sit down or stand up – or even the way in which we drink a cup of tea.
Tintagel, Cornwall, UK
