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In a message dated 95-12-03 14:44:24 EST, martz@holly.ColoState.EDU (Jeffrey
Martz) writes:

>One might argue (and some have), even in light of overwealming 
>evidence,  that saying that evolution really happened and that man 
>really landed on the moon cannot be verified 
>because we ourselves never actually saw it happen an it could all be a 
>humungous fake or misinterpretaion.  I refer to this way of thinking as 
>keeping your mind so open that your brains fall out.  Advocates of 
>BCF may feel that my brains are spilling in said fashion, but I 
>think that the evidence really IS too scanty in this particular case for 

Certainty, of course, can never be guaranteed, particularly when devising
evolutionary scenarios. Every scenario has alternatives, every scenario has
plausible objections. Perhaps the best thing to do would be to simply call
for a moratorium on speculation about the origins of flight until a
significant number of pre-archaeopterygid dino-birds (or whatever) are
discovered. How likely is _that_ to happen?!

But I still think "ground up" is impossible, and "trees down" works. :-)