'Who are we to say they shouldn't exist?': Dr. Neal Baer on the threat of CRISPR-driven eugenics

Since CRISPR was first conceived as a gene-editing tool in 2012, scientists have seen its awesome potential.

It promises to revolutionize the treatment of genetic disorders. It's being used to genetically engineer pig organs for transplant surgeries and to develop new antibacterial treatments. It's being used to breed crops and livestock, as well as modified mosquitoes that thwart the spread of disease.