There is time pressure at work, you are tired, you return home, and there is a mess; you are again arguing with your family; the evening is ruined. The best friend got a promotion and at every opportunity, as if on purpose, happily talks about it - it infuriates you, you try to meet him less often. Familiar? Why at such moments do we give vent to envy and anger, are ashamed of our own feelings, an...