I just found out that a friend requires a kidney transplant. I've heard that we are all equipped with two kidneys and can live with just one. How do I find out if I can donate a kidney? What's involved in a kidney donation? Thanks!

What natural food or herb can help soothe stomach ulcers?

As an avid contact wearer, I use saline solution to rinse my contacts daily before each use. Recently, a friend told me that many commercial saline solutions contain preservatives, which could affect the overall health of my eye. Is this something I should be concerned about? The saline I use has always felt comfortable so I never thought it could pose a problem.

Is there a reason behind spontaneous nipple hard-ons? Lately one of my nipples just stays that way for the majority of the day. It's irritating! Is there a reason behind it?

I have been a Type II diabetic for several years. I am now told I am beginning to show kidney insufficiency — is there a diet, or can you tell me where to find diet information of foods that a diabetic can use that are lower in protein and/or a renal diet?

I recently started taking birth control pills to help with my acne. But since it is considered a low dosage kind (Low Ogestrel, to be specific), I wonder if it is still an effective and safe contraceptive. Can I take this kind and not have to worry about getting pregnant?

I have trouble following spoken speech. It's always made school difficult for me and now it's one of the reasons why I think I'll have to quit college (I'm on leave right now). I would listen to lectures or go to instructors for extra help, but my brain just wouldn't absorb anything it heard. This put a huge burden of self-instruction on me and it made it impossible for me to participate in class discussions.

I think this tendency affects me in other ways too. For example, I don't and never have been able to sit through movies or watch TV — I never know what's going on in them. In daily interactions I manage OK with processing short exchanges of information or instructions, but I don't have "conversations" at all unless it's absolutely necessary, and when I do it's exhausting and unpleasant (I speak VERY little and have never had a friend, so it's no exaggeration to say that I don't have conversations).

Until college, I was always able to compensate for this difficulty by just studying hard and teaching myself. I got high grades and was going to a reputedly good college. Can you suggest any explanation for a problem of this sort and how to deal with it so that I might be able to graduate from college?