I'm no chemist obviously but I enjoy reminders like this that the "world of atoms" (not the world I live in most of the time, but certainly the one I'll die in) continues progressing.
The results showed a symmetrical structure with the berkelium atom sandwiched between two 8-membered carbon rings. The researchers named the molecule “berkelocene,” because its structure is analogous to a uranium organometallic complex called “uranocene.” (UC Berkeley chemists Andrew Streitwieser and Kenneth Raymond discovered uranocene in the late 1960s.)In an unexpected finding, electronic structure calculations performed by co-corresponding author Jochen Autschbach at the University of Buffalo revealed that the berkelium atom at the center of the berkelocene structure has a tetravalent oxidation state (positive charge of +4), which is stabilized by the berkelium–carbon bonds.