"I support policy X because it enables economies of scale and I am against polcy Y because it introduces a single point of failure."  

polcy -> policy

"But the most impotant reason for taking classes in writing is what it teaches you not to do." 

impotant -> important

great post, just wanted to point out a typo here: "I cant quote the equations of General Relativity from memory, but nonetheless if I walk off a cliff, Ill fall. "

it should be "I'll fall". good work otherwise.