–CNN
Previously, scientists have only been able to 3D print simple tissue without any blood vessels. Using a technique that involves a biopsy of the fatty tissue surrounding abdominal organs and reprogramming the cells to become stem cells, scientists were able to engineer a heart replete with cells, blood vessels, ventricles and chambers. Although the heart is still small at this stage, printing a human heart requires the same technology. This breakthrough could mean that in a few decades, organs could simply be printed out in a hospital, rather than having to find organ donors.