Amazing essay. Enjoyed reading it, and like the previous posters said, great experience. Two comments.
You are currently (by my calculations, over the limit @ 5,048 characters w/ spaces. I think something has to go (a sentence or a few redundant words perhaps).
The ending. I worked for me, but the very last sentence seemed to lack the same passion that we saw in the rest of the essay. If you end up finding the room, perhaps close it with a ref. to your opening with Mae Perm.
Overall, loved it. G/L.
BTW, loved the subtle reference that you worked as an undergrad because you had to, financially. I had a bit of trouble alluding to that in my PS, you did a good job, without playing the "disadvantaged" card.