Brain scans can now tell almost exactly what you're thinking
Researchers at Princeton University have figured out how to use functional MRI scans to tell what's on your mind. They can't yet tell exactly what you're thinking about, but they can get close enough to distinguish whether you're thinking about (say) an animal as opposed to a vegetable.
The next step is to fine-tune this method to be sensitive enough to start being able to discern more and more specific categories, like "root vegetables" instead of just "vegetables" or "ungulates" instead of just animals. As for the future, the researchers have this to say:
"If we give way to unbridled speculation, one can imagine years from now being able to 'translate' brain activity into written output for people who are unable to communicate otherwise, which is an exciting thing to consider."
We love unbridled speculation around here, but if you use even less bridlement, there's also the possibility that this sort of tech could be used to read people's freakin' minds! Maybe for good, maybe for evil, but either way, it's no longer science fiction: just science.