Physicists at Virginia Tech in the US investigated how a soap bubble freezes to become a beautiful ice dome. This only happens when the surrounding air is cold enough, otherwise the dome collapses. LION-researcher Daniela Kraft comments. 'This had never been researched before. I think it is beautiful to see.' (image Farzad Ahmadi, Christian Kingett)

https://www.nrc.nl/nieuws/2019/06/18/zeepbel-bevriest-tot-magische-sneeuwbol-a3964135