Unfortunately the link on the third post now seems to go to an SEO spam site, but the Web Archive seems to have the original - https://web.archive.org/web/20170

Unfortunately the link on the third post now seems to go to an SEO spam site, but the Web Archive seems to have the original - https://web.archive.org/web/20170303072943/http://richannel.org/mystery-of-prince-ruperts-drop-at-130000-fps https://web.archive.org/web/20170303072943/http://richannel.... which was a blog post featuring this YouTube video - https://m.youtube.com/watch?v=xe-f4gokRBs https://m.youtube.com/watch?v=xe-f4gokRBs