And also, the average heart weighs between half of a pound to 1 pound, depending on where you’re at. And also, your heart pumps about 2,000 gallons of blood every single day,” Adam Jacobson said.

It carried a heart specialist and his assistants, but they were not on an errand of mercy. Curiosity—the kind of curiosity that kills cats for science—led them on.

The breakthrough science focused on replicating heart tissues, bringing research closer to generating functional, bioprinted organs, which would have broad applications in disease modelling, drug ...