english: (Laughter) The fourth explanation is captured in the title of a book called "The Expanding Circle," by the philosopher Peter Singer, who argues that evolution bequeathed humans with a sense of empathy, an ability to treat other peoples' interests as comparable to one's own. Unfortunately, by default we apply it only to a very narrow circle of friends and family.
non_english: (smiech) Štvrté vysvetlenie je obsiahnuté v knižke "The Expanding Circle" (Rozpínavý kruh), ktorú napísal filozof Peter Singer. Ten tvrdí, že evolúcia ľuďom odkázala zmysel pre empatiu, schopnosť zaujímať sa o druhých približne ako o seba. Nanešťastie ho praktizujeme len vo veľmi malom kruhu priateľov a rodiny.