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Scientists 3D Print Human Heart Muscles

A human embryonic stem cell line derived at Stanford University. (REUTERS/Julie Baker/Stanford University School of Medicine/California Institute for Regenerative Medicine/Handout)
A human embryonic stem cell line derived at Stanford University. (REUTERS/Julie Baker/Stanford University School of Medicine/California Institute for Regenerative Medicine/Handout)
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Scientists 3D Print Human Heart Muscles

A human embryonic stem cell line derived at Stanford University. (REUTERS/Julie Baker/Stanford University School of Medicine/California Institute for Regenerative Medicine/Handout)
A human embryonic stem cell line derived at Stanford University. (REUTERS/Julie Baker/Stanford University School of Medicine/California Institute for Regenerative Medicine/Handout)

Heart diseases are the leading cause of death in the United States killing more than 600,000 people a year. A team of researchers at the University of Minnesota has 3D printed a functioning human heart pump in the lab, which could help save the lives of thousands of patients.

According to the Science Daily website, the researchers used a type of stem cells with the potential to develop into any type of cell in the body, in addition to a mix of proteins, and the printer's ink.

The heart muscle model is about 1.5 centimeters long and was specifically designed to fit into the abdominal cavity of a mouse for further study, the German News Agency reported.

The team said the new muscle can be used to study the functions of the heart, and the problems that might affect it.

Brenda Ogle from the Department of Biomedical Engineering in the University of Minnesota College, said this is a critical advance in heart research because this new study shows how we were able to 3D print heart muscle cells in a way that the cells could organize and work together.

"We now have a model to track and trace what is happening at the cell and molecular level. We can introduce disease and damage into the model and then study the effects of medicines and other therapeutics," she explained.

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Firefighters Battle a Wildfire Burning Out of Control on the Greek Island of Chios

A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
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Firefighters Battle a Wildfire Burning Out of Control on the Greek Island of Chios

A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS
A firefighting helicopter during firefighting operations on Chios Island, Greece, 24 June 2025. EPA/KOSTAS KOURGIAS

Hundreds of firefighters backed up by aircraft were battling a wildfire burning out of control for the third day on the eastern Aegean island of Chios Tuesday, with authorities issuing multiple evacuation orders.

Towering walls of flames tore through forest and agricultural land on the island, where authorities have declared a state of emergency and have sent firefighting reinforcements from Athens, the northern city of Thessaloniki and the nearby island of Lesbos, said the Associated Press.

By Tuesday morning, the fire department said 444 firefighters with 85 vehicles were tackling the blaze on scattered fronts. Eleven helicopters and two water-dropping planes were providing air support.

Emergency services have issued evacuation orders for villages and settlements in the area since Sunday, when fires broke out near the island’s main town. The fire department has sent an arson investigation team to Chios to examine the cause of the blaze.

“We are faced with simultaneous fires in multiple, geographically unconnected parts of the island — a pattern that cannot be considered coincidental,” Climate Crisis and Civil Protection Minister Giannis Kefalogiannis said Monday from Chios. Authorities, he said, were “very seriously examining the possibility of an organized criminal act, in other words arson.”

The minister said police forces on the island had been reinforced, while military patrols had been doubled.

“Whoever thinks that they can play with the lives of citizens and cause chaos with premeditated actions will be led to court,” Kefalogiannis said. “Arson is a serious crime and will be dealt with as such.”

Wildfires are frequent in Greece during its hot, dry summers. In 2018, a massive fire swept through the seaside town of Mati, east of Athens, trapping people in their homes and on roads as they tried to flee. More than 100 died, including some who drowned trying to swim away from the flames.