Two Americans and one Briton have won the 2018 Nobel Prize for Chemistry for developing new processes used to create drugs, chemicals and biofuels. Frances Arnold of the California Institute of Technology will receive half the prize, worth about $1 million. The other half will be shared by George Smith of the University of Missouri and Gregory Winter of the MRC Molecular Biology Laboratory in Cambridge, England. The Swedish Royal Academy of Sciences said Arnold used the processes of natural selection to create enzymes. Enzymes are complex proteins that make many chemical reactions possible. The academy described the process as being similar to biological evolution. It said the Nobel winners applied “the power of evolution and used the same principles, genetic change and selection, to develop proteins that solve mankind’s chemical problems.”