CLARIFICATION: Doctors Treat A Dying Girl With Modified HIV. The Reason Why Will Amaze You.

CLARIFICATION: Our original headline and intro on this post weren't quite right. Doctors didn't technically inject HIV into this girl — they treated some of her cells with modified HIV before injecting them back in. Lots more context is at the Cancer Research UK blog. Who knew something called a "serial killer" cell could bring so much unforgettable joy and happiness?