Hi guys, I think there must be a thing in your head, checking your information for certainty. For now, if there would be a working device on that, like Geiger counter, no one would even be able to believe it (as you laugh at religious people "god? you didn't even check if he exists!" and you fall in your own trap with science, which was checked only at approaches to you, but not in your head).Descartes must have joked, as there were no scientific check of our heads on certainty of thoughts, and he says brain knows for sure. You believe science is all books? Only if magic exists guys, you are funny, as you are not scientific and don't fullfill such dialogs about deeper things (than Einstein's brains' conclusions, for instance, or whatever, there were even no computers at that time!).
By the way, this conclusion came from futurism in russian literature, through youthful maximalism, because of it I'm on psychiatrists' registration. In case it's needed by someone, to think on it.