Sam: "I wonder if cavemen moved to a new cave when they saw the water levels rising, or did they wait for it to be lapping at their feet?"

- Yes, I'm sure they would have been able to perceive the benefit in the desired outcome, i.e., not being drowned - although, if the desired outcome was better fishing, maybe they perceived a benefit in waiting grin

"Time is what prevents everything from happening at once" - John Wheeler