In this heady time of mid-terms and papers it is all too easy to become lost in the ebb and flow of studies and find yourself far too focussed with your head in a book in the dim glow of a library evening.
Your time here is limited. You will have opportunities now that you may only dream about in future years. Do not be a friend to regret. I do not advocate failing your exams but I strongly recommend you step back, remember there is more to life than pure academia and ensure your experience at Harvard is a well-rounded one.