[Avodah] Hevel and bor

[Micha Berger]

My father (CC-ed, kindly use "reply to all) asked me to ask the chevrah:

According to the gemara, eg BK 50b-51a, a bor that is 10 tefachim deep
or more contains hevel which is dangerous to breathe. And even if it's
less than 10 tefachim, the air is still injurious.

My father was surprised that he couldn't find any rishonim or acharonim
who compare this to the experimental data. Not whether to dismiss it or
explain how it works -- no one seems to think it's intriguing and worth
discussion?!

Tir'u baTov!
-mi

-- 
Micha Berger             When memories exceed dreams,
micha at aishdas.org        The end is near.
http://www.aishdas.org                   - Rav Moshe Sherer
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