They are talking about…

Substantial π-aromaticity in the anionic heavy-metal cluster [Th@Bi12]4−“, A.R. Eulenstein, Y.J. Franzke, N. Lichtenberger, R.J. Wilson, H. Lars Deubner, F. Kraus, R. Clérac, F. Weigend and S. Dehnen, Nature Chemistry, 13, 149-155, (2021) – 10.1038/s41557-020-00592-z – hal-03133022

See below different links, which discuss this work:

In English:

https://chemistrycommunity.nature.com/

https://www.chemistryworld.com

In German:

https://idw-online.de/

https://www.uni-marburg.de/

http://marburg.news/

https://www.juraforum.de/