SA is simply being aware of what's going on around you at any given moment. These days, it's circling the drain. This is because we spend our days staring at screens with white lima beans in our ears. I, for example, can no longer locate certain body parts without Google Maps. For most of our 200,000 years on this muck ball, SA was the difference between life and death. If, say, you felt stickier-than-usual rain on your head, you could correctly infer that it was saliva from the open mouth of a T. rex standing above you and that the remainder of your day would be unpleasant but brief. A less aware person would only have realized this as the beast's large, serrated teeth closed on his throat. So that's not a great example. Let's say you noticed a flock of birds startle and take wing just as you felt a sort of rhythmic earthquake. A person with SA could interpret these seemingly unrelated events and conclude that a T. rex was approaching. Armed with a head start, he still couldn't escape the big lizard, which could run 27 mph. So that's not a great example either. Right now, my own SA tells me that you have a growing sense that I have no idea what I'm talking about. So let's move on, shall we?