INSIGHTS B — STAGING

In 2006, Shinya Yamanaka discovered you could take an adult cell and rewind it back to a stem cell using four proteins. He won the Nobel Prize for it. Now, almost 20 years later, someone is finally testing whether you can do a partial rewind in living humans -- making old cells younger without erasing their identity. The first trial has started. And it's a bigger deal than most people realise.