Can someone please grade this?

“Knowledge is power. In agriculture, medicine and industry, for example, knowledge has liberated us from hunger, disease, ad tedious labour. Today, however, our knowledge has become so powerful that it is beyond our control. We know how to do many things, but we do not know where, when, or even whether this know-how should be used.”

Assignment: Can knowledge be a burden rather than a benefit?

 The term "knowledge is power" is very true, especially in the modern world. I believe the benefits of knowledge such as cures to diseases, products of the industrial revolution, and provides power for our daily lives outweighs the burdens.
 Measles and chicken pox, which once caused thousands of lives to be lost, is now banal sickness that doctors today treat with ease. Overtime scientists and doctors examined these diseases closely and gained knowledge of how the specimen acted. Thus this new-found knowledge led to the formation of an antidote. Today the world can avoid common sicknesses thanks to the formulation of immunization shots and other remedies. 
 One of the most important and beneficial points in our history is the industrial revolution. Before the industrial revolution man had to travel for months by sea to get to the new world, or walk for hours to get to their destination. Soon man learned mechanical engineering through trial and error, which lead to the creation of planes and automobiles. Now traveling to another place takes a few minutes to a couple of hours. 
 Another example that proves my point is how man harvests power. During the early 1900's to mid- 1900's man used to power homes and other buildings with water power. Overtime man uncovered the secrets of nuclear power. Humans related how the water turning turbines to provide power to how they can use the same concept to make nuclear energy to power many buildings. Today nuclear energy is used to generate electricity for well populated cities. 
 I believe that whoever possess great knowledge can benefit the world and make lives easier.  

Probably an 8. Your examples are solid and support your point, but your concluding “paragraph” is too short, and the paragraphs are a bit disjoint. There are also some grammatical and mechanical errors (Use “over time” instead of “overtime.” There should be commas after “Today.”).

“Knowledge is power” is a phrase, not a term.
Did man not discover horses before cars?
You kind of ignored the “burden” part of the question.

Also, try to avoid clunky transitions like “another example that proves my point is…” That’s like ending with “And so that was my essay!” We know you’re writing an essay, but we don’t want to be reminded of that.