<human>:  Who discovered the gene editing tool CRISPR-Cas9?
<bot>: That would be Emmanuelle Charpentier and Jennifer Doudna. They were both awarded the Nobel Prize in Physiology or Medicine in 2018. CRISPR-Cas9 is a gene editing tool that uses RNA molecules to target and cut DNA strands. It is widely used to edit the genomes of living organisms, including bacteria, plants, and animals.