Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house.
科学建立在事实之上，就像房子用石头盖成；但是简单的事实堆砌并非科学，就像一堆石头不是房子一样。

——Henri Poincare, Science and Hypothesis
——儒勒·亨利·庞加莱