My parents took an interest in nothing, at home no books, no records. My mother and my father are the emblem of indifference, dryness and bad taste. My father is also terribly stingy, in life as well as in feelings: I have never seen him filling up the bathtub.
God, our genes, our environment, or some stupid programmer keying in code at an ancient terminal - there's no way free will can ever exist if we as individuals are the result of some external cause.
Schoolchildren and older people like the idea of planting trees. For children, it's interesting that an acorn will grow into an oak, and for older people it's a legacy. And the act of planting a tree is not that difficult.

