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1	要說哲理是吧？ 提假設的人應負責提出證據 富想像力者，想辦法證明自己是對的   只會狂想者，等著別人證明他是錯的 Alan Hale (Hale-Bopp 海爾波普彗星發現人之一）怎麼說？ In “An Astronomer’s Personal Statement on UFOs” (www.csicop.org)
2	An Astronomer’s Personal Statement on UFOs Extraordinary claims require Extraordinary evidence … The burden of proof is on the positive … Occam’s Razor …（刮鬍刀？）                     ─ Alan Hale  ─
3	Ockham's (Occam's) Razor A rule in science and philosophy stating that entities should not be multiplied needlessly, which is interpreted to mean that (1) the simplest of two or more competing theories is preferable, and that (2) an explanation for unknown phenomena should first be attempted in terms of what is already known.                             中文是說 ...
4	Ockham's (Occam's) Razor 如果有數個理論都可以接受，那麼就採用最簡單的那個 面對一個未知的現象，應該盡可能用已知的理論解釋，而先不急著發明新理論