I have heard it said that in 7 years, a person's whole body - every bit of it, down to the cellular (and perhaps beyond) level - is replaced in…

I have heard it said that in 7 years, a person's whole body - every bit of it, down to the cellular (and perhaps beyond) level - is replaced in…
I've been thinking a great deal about lines lately. Not just the drawn line, of which I am overly fond, but other lines and how we toe them.... train lines,…