Having an online conversation with somebody on the science of lefthandedness

It's entirely amiable, and we've mostly been talking about the fact that a. all studies on lefthandedness are shit and b. science definitely doesn't have the answer as to why.

I've learned a couple of things, namely that there is apparently a correlation between left-handedness and having twins. Not being a twin, I already knew that, but giving birth to twins.

As you all know, the frequent (and ridiculous) argument against LGBT rights of any sort is "There's no gay gene, so it's not born!" and usually my rejoinder is "Who the hell cares?" because seriously, I don't. (Did you know there's a small, but real, correlation between being lefthanded and being trans? I've got no answer for that other than "neurodiversity works in mysterious ways". Like, none.)

Anyway, this relates. If you do even a cursory review of the material, you rapidly realize that nobody has a clue when it comes to handedness. So next time, instead of "LOL! What a stupid thing to say!" I'll tell the haters "Listen, we still don't have a coherent theory of lefthandedness, and you expect us to have the gay thing figured out?"