Science

(...) children are taught in school that science is a collection of firmly established truths. In fact, science is not a collection of truths. It is a continuing exploration of mysteries.

Wherever we go exploring in the world around us, we find mysteries.

(From "How we Know", by Freeman Dyson, published in the NY Review of Books (http://www.nybooks.com/articles/archives/2011/mar/10/how-we-know/?pagination=false&printpage=true)