english: (Laughter) (Applause) (Live) SK: We now have on the order of 2,200 videos, covering everything from basic arithmetic, all the way to vector calculus, and some of the stuff that you saw up there.
non_english: (Gelach) (Applaus) SK: We hebben nu ongeveer 2.200 video's die alles omvatten, van elementair cijferen tot vectorcalculus, plus nog wat dingen die u daar zag.