If your life doesn't have some grand narrative to write about - in other words, like most of us, you didn't join the Peace Corps, spend a year living in a grass hut with the Bushmen, and discovered the cure for cancer in your spare time - I would suggest focusing on one specific incident or activity and write about that. Write with passion and feeling about *something* and you'll have a better PS than the 90% of applicants who'll wind up with something dull and uninteresting that will encourage adcomms to take that post-lunch afternoon nap.
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