Nature vs. Nurture

Woman: Actually, my psychologist sister told me prematurely grey hair is not genetic, it is a trauma response.
Man, triumphantly: Oh yeah? Then why does everyone in my family have prematurely grey hair?

Genetics

Gamma fell *up*  a step this weekend and broke her foot. She said nothing much about it until the next day. I think she inherited my coordination and her mother’s stoicism.