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.



Solar Becomes Europe's Main Energy Source in June

Solar had never before been Europe's top energy source, consultants say. Damien MEYER / AFP/File
Solar had never before been Europe's top energy source, consultants say. Damien MEYER / AFP/File
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Solar Becomes Europe's Main Energy Source in June

Solar had never before been Europe's top energy source, consultants say. Damien MEYER / AFP/File
Solar had never before been Europe's top energy source, consultants say. Damien MEYER / AFP/File

Solar power became the European Union's biggest single energy source for the first time in June, an energy think tank said Thursday.

The Ember group that researches the clean energy transition said that 22.1 percent of Europe's power in June came from solar panels, reported AFP.

That came ahead of nuclear power on 21.8 percent and wind turbines on 15.8 percent, according to the British-based institution. Gas accounted for 14.4 percent and hydropower 12.8 percent.

Ember said that at least 13 countries beat their national record for solar power production.

Wind power production also hit a new record for Europe and coal has never accounted for such a low proportion of Europe's electricity output -- Ember estimated it at 6.1 percent across the continent, down from 8.8 percent in 2024.

But with demand for electricity rising, the use of coal in the first half of 2025 was still higher than the same period in 2024, Ember said. Electricity demand in the first six months was more than two percent higher than last year.