Today, when walking in the street or wherever you are, smile and say Hello to five complete strangers. Do you feel uncomfortable about it? Well, think about it this way: how do you feel when somebody you do not know smiles to you? My bet is it makes you feel better. It definitely does it for me. How do you think this person feels in return? Probably better too. So do it. The most important is the smile, so if you wish as a first step, just smile to people. Really smile to them, while looking at them. It takes two seconds for each smile.