Three people were gene-edited in an effort to cure their HIV. The result is unknown.

The gene-editing technology CRISPR has been used to change the genes of human babies, to modify animals, and to treat people with sickle-cell disease.  Now scientists are attempting a new trick: using CRISPR to permanently cure people of HIV.  In a remarkable experiment, a biotechnology company called Excision BioTherapeutics says it added the gene-editing tool…