Loneliness can be depressing, but it may have helped humans survive

Loneliness not only feels nasty, it can also make you depressed, shatter your sleep, even kill you. Yet scientists think loneliness evolved because it was good for us. It still is — sometimes.
Read more: https://www.washingtonpost.com/national/health-science/loneliness-can-be-depressing-but-it-may-have-helped-humans-survive/2016/09/02/c01a15f4-38a0-11e6-8f7c-d4c723a2becb_story.html?source=Snapzu