There once was a village that was built atop a huge hill. Life there would have been perfect, save for one problem: the only source of water in the area was a river that flowed past the bottom of the hill. Each day, the villagers would have to make their way down the hill to fill their water buckets and trudge them back to the top. Ordinarily, this wouldn't have been too bad, but the hill was so tall and the river so far away, it took hours just to make the round trip.
The ruler of the village offered a huge reward to anyone who could bring water to the village without taking several hours. All manner of complex engineering schemes were tried, but none were successful.
One day, a wandering minstrel happened upon the village and, seeing the villagers struggles, decided to help.
"Okay," said the minstrel, "the first thing you need to do is plant as many cucumbers as you can."
The villagers were confused by the instruction but, being desperate for a solution, they did as they were told and in a few months were rewarded with a bumper crop of cukes.
The minstrel took all the cucumbers, put them into a large barrel and began to pickle them.
"Now," said the minstrel, "I need a group of people to dig a trench. Start at the riverbank, go up the side of the hill and into the village. Then make a U-turn and go back down the other side of the hill and end a few yards downriver from where you started."
Again, the villagers were confused but compliant and, after several weeks the trench was completed.
"Great," said the village leader. "We have a trench that connects us to the river, but even a child knows that WATER CAN'T RUN UPHILL."
The minstrel, replied, "Watch." Starting at the top, he took his barrel of pickles and began to line one side of the trench with them, working his way down towards the river. To everyone's astonishment, when the last pickle was put into place, water from the river began flowing into the trench, up the hill, through the village, and back down the other side.
"It's a miracle," the villagers cried.
"It's magic," the village leader exclaimed.
"It's common knowledge," said the minstrel.