Closure is a psychological construct that describes how we struggle with the ambiguity of the world. In the past week, I have thought about the importance that the need for closure plays in human affairs. Arie Kruglanski explains why, in the video link below:
https://static01.nyt.com/video/players/offsite/index.html?videoId=100000004740462
peakmemory 
Excellent video. I am very frightened of uncertainty and this video has exacerbated my fears!