4 ms·It's so rare to see such a clear and intuitive explanation. This video is amazing.by rubymamis 2y agoIt's so rare to see such a clear and intuitive explanation. This video is amazing.porjo 2y agoThis. It is a rare and unique thing for the author to a) have the skills to put together such a presentation and b) take the time to do so. Thankyou.deleted 2y ago[deleted]mi_lk 2y agoJust watched some of his videos and they are really good. Kudos @nicoburns