I would like to see a registration requirement, so I know who I'm responding to. Sometimes it's helpful, since over time, you begin to get a feel for people's personalities and backgrounds based on their responses, and I think it prevents misunderstandings when you reply to a post. If someone is overly sensitive to certain issues, or already has a certain level of knowledge in a certain area, you can avoid inadvertently offending someone by making light of a subject the originator is quite serious about, or giving "newbie" advice to a veteran, or vice-versa.

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It wasn't raining when Noah built the ark.