The reasoning behind why a baby bonds to their parents was often assumed to be related to the fact the mother is the one supplying food to the baby. So through reinforcement of food, the baby grows fond of the parents. Harry Harlow went forth in life to disprove this. By examining a baby monkey, he found it prefer ed going to a "comfortably" fake mother with no food, instead of a rigid and rough fake mother with food.
My god! What does this mean?
This shows that the comfort a baby has comes more from the physical touch than the knowledge of food or comfort of survival by affiliating with people. So next time you have a baby, wear a comfy sweater to hold it instead of that plate mail you normally dance around in. You will be more liked.
Does this apply to older people as well? When people have a bad day, full of tears and sad songs. Human contact is usually the best medicine, in the form of a hug. But people also indulge on things like snack treats to calm themselves. So what has a better effect?
Also as we get older, a random person touching us may seem weird. So do you not just randomly start touching strangers. First introduce yourself. Don't hide behind bushes.