^ A great research started on YouTube, which ended up in Nature: http://www.nature.com/nchem/journal/v7/n3/full/nchem.2161.ht....
It's why it makes sense to study "already well understood" processes (to the point that sodium explosion is used as one of typical chemistry experiments for high schools).
https://www.youtube.com/watch?v=LmlAYnFF_s8