<p>Why are you baffled? Because with a 14% acceptance rate it was a sure thing you were being accepted? This is YALE. Yes, your resume there looks very impressive, but clearly there’s always going to be a lot of very impressive applicants.</p>
<p>You’ve already sent supplemental materials, so I don’t think it’s necessary to send any more. Unless there’s anything new you can show them, that is not already otherwise indicated on your application, then you don’t need to do anything.</p>
<p>You just have to appreciate that there are a lot of very other competitive applicants. You will no doubt get into a great school, whether or not it will be Yale is yet to be seen. Either way, best of luck to you.</p>