Recently came across these tiny majesties.
- Gray = carbon atoms and covalent bonds
- Red = any molecule small enough to fit
Apparently, they are called endofullerenes. Crazy expensive molecular cages at around $ 100 to 200 million. Their current possible applications are for GPS trackers due to their being accurate down to the millimeter scale, therefore good for even more portable and precise space (for avoiding collisions in self-driving cars) as well as time measurements (as in handheld atomic clocks).
I can only think of them being good quantum dot components, possibly by putting inside supersensitive ions or compounds, but how can such little ball of a beaut be possibly applied or even create other technologies? Let your inner nanotech geek go wild