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At Princeton, of all places, it would be easier. Because Princeton is devoted to undergraduate teaching. There are twice the number of undergrads as there are grads, and no professional programs. Thus, professors are more open to undergrad research. But that depends on professor, of course. It also depends on your past experience and how much time you’re willing to dedicate to the lab. From what I’ve heard, professors prefer students who are willing to dedicate several years to the lab, to make up for the training and development. </p>
<p>As for freshmen, I know two who worked in chemistry labs as freshmen. I mean, the opportunities won’t fall in front of you - you have to ask and go looking for them, but that’s the general rule. As a freshman, I also did some research, in the social sciences.</p>