That's oversimplification but the basic idea is that our quest to be a community of people who treat each other with love is part and parcel with the scientific method.
From the enthusiasm of the early days, through enlistment, training, the boredom of army life, the misery (but sometimes black humour) of the trenches, the obsession with food and tobacco, the joy of a parcel from loved ones, the fear and danger of combat, the randomness of death and injury, and the final return home for those lucky enough to make it.
From their physical health to their emotional, from known hazards to the ones we don't see coming, protecting them is part and parcel of loving your kid.
(And why should a pessimist's negative thoughts "bring about his own destruction" through fighting rather than diplomacy? Isn't an optimist just as likely to throw himself into doomed battle?) And while the humanists among us may wish it so, how can we confirm that natural selection tends to preserve "altruism, fidelity, bonding and those qualities that are all part and parcel of mature love"?
It's not that I'm ungrateful for the time and care family and friends put into sending their love in paper format, in parcels and envelopes.
But it remains part and parcel of modern mother love.
Or is just part and parcel of the whole "love, honour and cherish" deal?
Of course, seeing your partner as the cat's meow is part and parcel of falling in love, Fletcher says.
The advert features the Royal Mail Choir, singing their version of the Beatles' All You Need Is Love, while postmen and women deliver parcels to their appreciative customers.
With the diary entries and the quick, seasonal recipes, Slater makes good on his "plea for both good food and a love of cooking to be just part and parcel of our everyday lives".
