I am regularly asked what average Internet users can do to ensure their security. My first answer is usually, "Nothing--you're screwed."
As a result, I've [wasted] hundreds of hours in code reviews because [I couldn't follow instructions]
FTFY.
Yeah, a lot of people have misconceptions, which is often why there are expert witnesses to clarify issues that aren't commonly in the general body of knowledge. However, that doesn't mean that any knowledge not gleaned from an expert witness is forbidden.
If you have special knowledge or information about any of the facts of a particular case , you should not communicate that information to other jurors. In deciding a case jurors are expected to bring to bear all the experience, common sense and common knowledge they possess; but they are not to rely on any private source of information
Emphasis mine
That means you can't use the fact that you happen know the defendant is left handed, or that the company he works for is releasing a new thing next week (because you work for the company too). On the other hand, if you know that guns can't be fired underwater, or that silencers as presented in movies don't actually exist, and it's pertinent to the case, you can fucking well say so. You just can't look stuff up that you don't already know.
"The one charm of marriage is that it makes a life of deception a neccessity." - Oscar Wilde