uncertainty (un)defined
 …I think it’s much more interesting to live not knowing than to have  answers which might be wrong. I have approximate answers and possible  beliefs and different degrees of uncertainty about different things, but  I am not absolutely sure of anything and there are many things I don’t  know anything about, such as whether it means anything to ask why we’re  here. I don’t have to know an answer. I don’t feel frightened not  knowing things, by being lost in a mysterious universe without any  purpose, which is the way it really is as far as I can tell…  ~ Richard Feynman  
