"[The] first postulate of the Principle of Uniformity, namely, that the laws of nature are invariant with time, is not peculiar to that principle or to geology, but is a common denominator of all science. In fact, instead of being an assumption or an ad hoc hypothesis, it is simply a succinct summation of the totality of all experimental and observational evidence."
Source : "First Amendment Attorney Floyd Abrams Talks with CFIF’s Corporate Counsel About Three Decades of Free Speech". "Your Turn", www.cfif.org. June 15, 2005.