> ...but despite our best efforts it cannot be detected... Keep in mind that virtually every way we have of detecting things involves electromagnetism. If ther

> ...but despite our best efforts it cannot be detected... Keep in mind that virtually every way we have of detecting things involves electromagnetism. If there were to be some form of matter that does not interact with the electromagnetic force, then there would be very few ways we could actually detect it, gravity being one of them.