When scientists insert rhesus macaque genes plus jellyfish genes into unfertilized cat eggs, the cats that result post-fertilization are resistant to feline immunodeficiency virus, which causes feline AIDS. They also glow fluorescent green under "special" lights. What if you do this to human eggs?

To remove a tumor "the size of a calzone," doctors split a woman in half and attached her leg to her spine. They're calling it a "pogo stick" surgery, the first of its kind. The patient is in good spirits.