The most famous scientists are usually those who investigate existential questions, such as physicists who study black holes or theories of gravity, or those who solve medical problems, like the creators of the Covid-19 vaccines or those searching for cancer treatments. There is another group of researchers, however, who have an even greater impact on our daily lives than these famous scientists, but tend to go unnoticed. The chemist John Hartwig, 60, from the University of California, Berkeley forms part of this little-heralded legion.