[Avodah] our understanding(s) of fire......change in halacha??

[Harvey Benton]

our understanding of fire (and its' associated electricity cousin) in the minds of the poskim, are not the
same as they were at the turn of the century when they decided that 
electricity was assur on shabbas. now our understanding has changed, and for instance we know that
not all fires (eg underwater flares) are the same; 
is there a nafka mina in that in the times of the gemarra if a tanna or amora passed a halacha (and the 
reason(s) changed, we do not change the halacha (eg snakes in am water), 

mecz
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.aishdas.org/pipermail/avodah-aishdas.org/attachments/20110915/2708fc7a/attachment.htm>