Earlier, the Babylonians had attempted to map the world, but they presented it in the form of a flattened disc rather than a sphere, which was the form adopted by Ptolemy.
When did it become accepted wisdom that students should be able to name the 13th president of the United Sates but be utterly overwhelmed by a broken bike chain?
Only when a system possesses natural or artificial boundaries that associate the water within it the hydrologic cycle may the entire system properly be termed hydrogeologic.
I have to teach the same course books several times in the summer holiday camp, which is sometimes boring and not well-paid, but by and large, I am quite delighted in being with young people.