Cold cases that once baffled investigators are getting solved with help of cutting-edge DNA technology In a "20/20" special report, David Muir weaves together two decades-long probes.

Federal judge releases Kseniia Petrova, a Russian-born cancer researcher accused of smuggling frog embryo samples, while limiting her travel and maintaining custody of her passport.

Paul Rand: When we can’t find a way to relax our body, our cortisol levels can increase. This is the second piece of the puzzle of how grief causes bodily harm. Mary-Frances O’Connor: Cortisol ...

To better understand how AI voice tools might transform the future of language learning, I spent a month practicing Japanese with the ChatGPT smartphone app before traveling to Tokyo for the first ...