I have learned:
1) the smell of formaldehyde no longer stimulates a gag reflex
2) having human tissue remnants on your scrubs no longer bothers you
3) waking up in the middle of the night several times thinking about different anatomical structures is completely normal
4) all the books you read and documentaries you watched about the importance of eating healthy, eating raw and organic pretty much do not apply anymore
5) memorizing so many new facts causes you to forget everyday terms and items such as, the thingy that opens the thing...
6) you begin to not shower as often as you once thought normal and/or hygienic.
:)