A beginner’s guide to the CRISPR gene-editing technique, and the considerable ethical concerns that come with it. Tinkering with DNA could wipe out Parkinson’s, Alzheimer’s, and diabetes, but any changes made will be passed on to the patient’s descendants for all time. Now Chinese scientists have gone ahead and edited human embryos in this way, in spite of researchers pressing for a worldwide moratorium on such experimentation.

http://america.aljazeera.com/watch/shows/live-news/2015/4/chinese-scientists-find-a-way-to-alter-dna-in-human-embryos.html