The cause of kitchen sink smells is often decomposing food in the garbage disposal or P-trap, but unless you're in the habit of dumping kitchen waste in the bathroom sink, smells from that drain usually come directly from the sewer. They occur because the drain vent is blocked and the P-trap has been drained.
Humanitarianism is a moral of kindness, benevolence, and sympathy extended to all human beings. Humanitarianism has been an evolving concept historically, but universality is a common theme in its evolution. No distinction is to be made on the grounds of gender, sexual orientation, race, caste, age, religion, ability, or nationality.
Ethics (from the Ancient Greek word ethikos meaning 'theory of living'), is a type of philosophy which attempts to figure out that right versus wrong in any given situation or scenario. In general terms, ethics are practical moral standards that distinguish right from wrong, and give us a guide to living 'moral' lives. These standards might include duties that we should follow, such as fidelity in marriage, or the consequences of our behaviour on others.