Don't pay them much "mind"
Why do I have some strange attraction to mental illness - sanitariums - and the such? Maybe it was that severe blow to the head.
If I could swing several careers, why would I want to become a designer of prosthetics (and/or assistant of) amputees? Maybe it was the trauma of seeing a man without a nose as a child, and I've come full circle and beyond. The mind is a strange thing.
If a human being is cloned...his clone would be more like his twin...each person is a creation of all they experience: tasting, touching, seeing, hearing and smelling...and no two individuals (even clones) would experience the same sequence of stimuli.
If you are ambidextrous it is more difficult to tell your right from your left (because there is no strong pull one way or the other). Righties are more aware of their right hand, Lefties are more aware of their left. Ambidextrous people...well, you get the idea.
Humans have much more mental control over pain and healing of their own bodies than they realize. I know people who have healed themselves faster, relieved stomach pain by concentrating - focusing - and meditating.
I personally can stop hiccups abruptly by concentrating on pushing the hiccups back down through my body...works 99% of the time, and now after years of doing it, it only takes a few seconds to do - try it sometime.
The sixth sense is based on expanding your mind - being receptive - on a different level - of all the things around you.