By adding jellyfish DNA to a common species of pet fish, science created the GloFish. We can remote-control moths and roaches, breed goats whose milk prevents disease, and create lab mice that are prone to the exact diseases researchers are trying to find cures for. But should we be doing any of these things? Joy Cardin's guest has researched the many ways we're tinkering with animals these days, and joins to discuss not just what we're doing and why, but the ethical questions they raise.
