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Take a few milligrams of berkelium, a rare radioactive metal that can be made only in specialized nuclear reactors.

Over the course of 30 years, his inventions contributed to the discovery of americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium, rutherfordium, dubnium and seaborgium.

It is evident in entries like francium, germanium, scandium, polonium, europium, californium, berkelium and americium.

Naturally there are berkelium, dubnium and darmstadtium, as well as livermorium - named after the Lawrence Livermore National Laboratory that, among other things, ensures that the US nuclear stockpile does not decay too quickly.

“We had to team up with the only place on the planet where berkelium can be produced and isolated in significant quantities,” Düllmann says.