Kary Mullis was an American biochemist who made a significant contribution to molecular biology through his invention of the polymerase chain reaction (PCR) technique. Developed in 1983, this revolutionary method allows for the amplification of specific DNA sequences, making it easier for scientists to study genetic material. PCR has since become a fundamental tool in fields such as medicine, forensics, and research, playing a vital role in diagnosing diseases and analyzing genetic fingerprints. Mullis's...