If you have genuinely no idea why you know that and where you learned it, you should probably seek medical advice concerning maybe early onset dementia or some such.
There's a good argument to be made you learned about potentially dangerous insects as a child, from books aimed at children. A reasonable person would make this argument. It's also likely that you retained that information because your would-be peers who aren't around, aren't around because their ascendants inserted their genetic material in to the humanity's descent's to a lesser extent than your extant peers.
You might not be able to immediately recall where and when you learned something, and that shouldn't be equated with genuinely having no idea.
