Mensa is a group for people who score in the top 2% of IQ tests. I don't like to admit it very often, but I'm a card-carrying member. I find this embarrassing, I suppose like someone in AA would feel. If you're an alcoholic around other alcoholics, it's perfectly fine to admit you're a drunk. If you're smart, it's okay to admit you're a geek to other geeks. They're my people. I love them. We have great conversations over bagels.
I learned cool stuff about mercury from a respected chemist this month, and he seemed tickled to find someone interested in learning about it. I have no plans to do anything with mercury, and he won't repair his mercury clock because filling it with mercury would be too heavy and toxic. I know, nobody else cares. That's why there's a group for people who like to learn completely useless stuff, where nobody rolls their eyes at us.
I've spent a lot of my life hiding my brains because it's so uncool. Being "too smart" can get you beat up on the playground, though luckily I never had that problem. I suppose some people feel intimidated by Mensans, but I've found most of them to be open and helpful in explaining anything and everything that anyone else wants to know. They're like Labrador retriever mutts. Stick! Cool! Let me get that for you! Do you want another stick? Squirrel? Sock? Ball!!!
My original plan in joining in my 20s was to find someone interesting to date. That accomplished, I let my membership lapse. It wasn't until a lot of years later, and the breakup of another relationship, that I decided that I just wanted to hang out with my kind. I discovered my brain was really, really rusty. I felt intimidated and didn't say much until I discovered that Mensans are just like everyone else. They've got opinions and biases. They're nice or not. The only thing you know they've got in common is that they're good at taking tests.
Many of the members are scientists and engineers, though there are a splattering of artists mixed in. I think plenty of artists would qualify if they believed they could because artists often have that same kind of interest in everything. Artists devote a lot of time to reading and studying all sorts of things. There's a young lady in my group who loves Harry Potter as much as I do. It's not all about molecular chemistry. We spent an afternoon coloring together recently.
Sometimes the young daughter of a member comes to our group. She colored with us too, and she blends as well as the grandparents in our group. Age, sex, color, etc. doesn't matter, and I really enjoy diversity.