This is actually an area up for debate, though SDN has been arguing it's a faux pas for a while. My school suggested we list everything we had on our apps for med school in addition to what we've done during med school. To provide an anecdote, I listed most stuff from the beginning of college till now and I've gotten interviews at most places I applied, including some big names. I didn't do anything astounding at any point, but at maybe 1/2 of these visits my interviewer would ask about one of these pre-med activities. And, I'll be honest - you probably haven't done anything that cool in med school (I know I sure as heck haven't). Point being, the activities are routinely used for starting conversations at these interviews, and if all you've got to talk about is giving rats drugs... This being anecdotal, I'm sure another poster could provide a horror story, but this has been my experience. The activities are listed in reverse chronological order - if they have a problem with college activities they're probably just ignoring the bottom half of the page.