Why do opposable thumbs exist in humans and other primates? Scientists generally agree that the appearance of the opposable thumb was a key evolutionary point in the development of our species. It is what allowed primates to grip and climb and move into the trees, away from the realm of large predators looking for a meal. Opposable thumbs also proved to be pretty handy from a toolmaking and tool using perspective, whether the tool was a stick to be manipulated or a rudimentary axe.
All of this is true, Curiously, however, scientists haven’t fully explored whether the opposable thumb was developed in anticipation that modern humans who are too cheap to buy a nozzle for their garden hose might need the thumb to water their yard and plants on a beastly hot summer day. Sure, the opposable thumb might not have been evolved specifically for watering and hose wielding, but it sure works well for that purpose — whether you want to generate a gentle sprinkle or a high velocity jet to reach the side of the yard beyond the length of the hose.
How do we know for sure that our distant ancestors weren’t big on watering?