In a breakthrough just published by Nature on July 11, 2025, scientists announced they’ve grown tiny human organs—complete with their own blood vessels.

These lab-made “organoids” include miniature hearts, lungs, and livers, all built from stem cells. What makes this different? For the first time, the organs formed vascular networks on their own, allowing nutrients and signals to flow through them like in the real thing.

It’s a major step toward creating realistic human models for studying diseases, testing drugs, and one day… maybe even growing full-size replacement organs.

No, it’s not science fiction. It’s science, as of this week.