From David Gibson
You report on self-trackers who record many aspects of their lives (4 August, p 40), and I must confess to a similar habit: I have a record of every bath I have had since I was a teenager (I am now 53). Over the same period, I also have a record of every cold I have had.
My father was a compulsive record-keeper, too. He recorded the heights of each of his three children, monthly, until we left home. The graph is interesting because it shows a distinct annual growth cycle.
Despite our being born in different seasons, we all grew more in summer than winter. I was about to ask if this is a new observation but, having looked a little deeper, I realise it isn’t.
Leeds, UK
