US owl-killing experiment raises thorny questions

As he stood amid the thick old-growth forests in the coastal range of Oregon, Dave Wiens was nervous. Before he trained to shoot his first barred owl, he had never fired a gun.

China AIDS group 'really regrets' role in gene-editing

The head of a Chinese AIDS support group expressed deep regret Friday for helping a scientist recruit participants for a controversial experiment claiming to have created the world's first genetically-edited babies.