Year in review: Breakthrough gene editor sparks ethics debate
Researchers use CRISPR to edit nonviable human embryos
![CRISPR](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/12/122615_2_feat.jpg?fit=860%2C460&ssl=1)
CUT AND PASTE This year, the gene editing system CRISPR has opened the door to new scientific advancements — and ethical concerns.
Illustration created by Stephen Dixon and Feng Zhang