This is a practical implementation of gene drive, which to me is as amazing as a practical implementation of warp drive.

http://en.wikipedia.org/wiki/Gene_drive

We should be careful, but this is an extremely exciting development. We really are living in the 21st century.

What this enables is a way to let evolutionarily unfavorable gene to win by cheating evolution. Sometimes being evolutionarily good clashes with benefits to humanity, but we had no recourse. Now we do.