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Hmm.. good question.
Taking 'cannot live without' literally I end up with the following:
Farming & Fertilizer
Domestication
Pottery
Masonry
Carpentry
Surgery & Medicine
All rather broad and not very inspiring items, no?
Taking a few steps up on Maslov's pyramid I'd say:
Writing, Literature, Books, Novels, etc.
Computers, NICs, routers, switches, TCP/IP, Cat-5, BIND, etc
Telephones (due to job)
and Mass Transit (no car for me... yet)
--K
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