https://www.wired.com/story/what-is-crispr-gene-editing/?mbid=nl_120517_daily_list3_p1When people refer to Crispr, they’re probably talking about Crispr-Cas9, a complex of enzymes and genetic guides that together finds and edits DNA. But Crispr on its own just stands for Clustered Regularly Interspaced Palindromic Repeats—chunks of regularly recurring bits of DNA that arose as an ancient bacterial defense system against viral invasions.