The genome editing technology CRISPR revolutionised genetic engineering by allowing scientists to cut and paste tiny snippets of DNA with more precision than ever before. Now, one of the groups responsible for that technology has harnessed the power of CRISPR to also edit RNA, a molecule that, like DNA, is essential in the coding, regulation, and expression of genes. This development could eventually allow scientists to alter the expression of genes in the human body without having to change the genome itself.