Stanford scientists just solved one of the biggest problems with human aging.

They found a way to regrow joint cartilage.

They blocked an aging-linked protein called 15-PGDH, and the results were massive. Old, worn cartilage began to grow back in older mice. Human cartilage samples also showed signs of new cartilage growth.

This is a massive milestone for human longevity. Actual biological repair. Proof that the body can fix its own parts.