The phrase "just anyone".. Hmm.
Ok maybe the thing to do is to be slightly snobbish about sharing your interests. The rest of the world works on a system of perceived value, which may or may not have anything to do with intrinsic value. When you share too much too quickly, it's perceived that even you don't value what you say, even though by giving it away you haven't actually subtracted anything from your store of stuff like you would have if you'd given away a broom or a bicycle. Does that make sense? No? Well nobody said it had to.
The sept. 11 attacks made me feel a certain anger, bondedness and solidarity with the people around me that I never experienced before. Part of the development of one of my particular interests was at least partially initiated by this event. By working on something that will benefit everyone, and which everyone should be able to understand at least in overview, I hoped to expand my opportunities to connect with people. I have succeeded, because I have a few people I work with on this, but I can't share it with "just anyone" because that devalues it somehow.
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A boy and his dog can go walking
A boy and his dog sometimes talk to each other
A boy and a dog can be happy sitting down in the woods on a log
But a dog knows his boy can go wrong