[Science] is not perfect. It can be misused. It is only a tool. But it is by far the best tool we have, self-correcting, ongoing, applicable to everything. It has two rules. First: there are no sacred truths; all assumptions must be critically examined; arguments from authority are worthless. Second: whatever is inconsistent with the facts must be discarded or revised. … The obvious is sometimes false; the unexpected is sometimes true.

~ Carl Sagan (1934-11-09 1996-12-20 age:62)