> Some people, however, think that we should accept current 
> explanations and reject the older ones.  Sometimes it 
> matters, sometimes it doesn't.
> And sometimes we progress by going back to old ways.  
> Medicine comes to mind.  We used to think using leeches was 
> crazy stuff from older times.
> Now we've found them quite useful.


That's true, but not quite.

Why they were using them in the middles ages is different to why they're
used now.  You could say we found a new use for something that was supposed
to be useful but wasn't.  (You might need to take a beep breathe first.)

Tony

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