It is pretty darn clear that things like remote viewing are not real. There is some room to have a human brain that processes its normal sensory input in unusual ways.
For example some people really do seem to have synesthesia
. They may get vivid impressions of color in response to sounds, or hear tones in response to certain odours. Some people have good situational awareness; they notice what's going on around them, and keep it in mind, to a degree that most people don't.
It has at least been speculated that some people may be able to detect subtle patterns in other people's posture or facial expressions and thereby form instinctive impressions of what the other people are about to do, at least for some kinds of action. I'm not sure how real this ability is, but I don't see why it couldn't be possible in principle. If it did work, it might seem a bit like telepathy.
It is in principle possible to use artificial instruments to give people much more information about the world than our natural senses supply. Astronomy is mostly about this, for example. Our eyes have really crude frequency resolution. If our ears perceived sound frequency the way our eyes perceive light frequency, a piano would have only three fat keys, together spanning less than one octave, and music would consist of nothing but three-note chords with more or less force on each key. With instruments that can resolve light frequency much more finely, however, observing light from distant stars is like listening to a symphony and clearly distinguishing not only many different notes, but whether the notes are being played on strings or woodwinds or brass. You can see what the star is made of, how hot it is, how strong its magnetic field is, and how fast it is moving, just by seeing a lot more frequency detail than the naked eye sees in that little bright twinkle.
One can imagine giving people artificial eyes or other sensors that would reveal a lot of things to which we are naturally blind. I think the problem would be finding a way for our brain to process the extra information. Our brains are wired to recognize just three primary colours; it's not clear how they could cope with vision that didn't just show millions of different combinations of those three colours, but that actually had thousands of primary colours.
I once read about a guy who implanted a little magnet under the skin of his finger, so that he could feel magnetic fields. I don't know that it's a good idea but it could certainly have worked. Any magnetic fields around his finger would push on the magnet and he could probably feel the push under his skin. So there may be room for extending human senses in this kind of way, supplying new input to our existing natural senses. Maybe the more detailed frequency information in light could get represented as smells.
I was a teenager before it was cool.