The pros and cons of mental time travel

There are ways to rejuvenate old memories, but a new study has compared the process to the myth of Sisyphus, who was cursed to repeatedly roll a stone up a hill. 

Also on the show, many doctors are already using artificial intelligence to help take notes. But are patients always aware these AI scribes are in the room?

The emergence of vaping has slowed our progress when it comes to smoking cessation. 

And looking at a sick person might activate your immune system, getting it ready to fight off infection.