Not so intelligent design

The second item on this list of facts about thirst makes me even more convinced that the design of human beings is poorly optimized. Consider that one can go only a few days without taking in water, and it would seem as if this would be a high priority item for a designer to get right. Why wouldn't dehydration make us thirsty automatically, instead of making us hungry or tired or forgetful? Even I as designer, non-omniscient as I am, would have taken some care to get that basic drive right before going on to the rest of the creature.

On the other hand, evolution skeptics would cite the same item to point out that if human ancestors developed in the relatively dry African savannah, it would seem as if natural selection ought rightly to have cleared out any individuals who were apt to misidentify the need for seeking out a water hole. Humans who originated in a place with four wholesome rivers, in present-day Iraq might be expected to be more casual about decent hydration. Fallen mankind outside of Eden just inherited a design that was meant for a quite different setting.

All I know is that it's time for a cup of tea while I ponder human shortcomings.