Board Thread:Theories and Speculation/@comment-34656247-20190511162946/@comment-3568954-20190518062745

normal humans can tell when they are being watched or when someone is in there presence. we humans are remarkable beings. lets just go with this. we see eachother because photons enter our eyes and bounce off the back of our eyes. studies show that the eye is so sensitive that humans can perceive down to a single photon. a single photon isn't enough to give an image. but its enough to alow humans to perceive a sensation. just imagine how much superior a shinobi would be in that manner