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.



Vietnam Scraps Two-Child Limit as Birth Rate Declines 

A grandfather talks to his grandchild inside a kindergarten in Hanoi on June 4, 2025. (AFP)
A grandfather talks to his grandchild inside a kindergarten in Hanoi on June 4, 2025. (AFP)
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Vietnam Scraps Two-Child Limit as Birth Rate Declines 

A grandfather talks to his grandchild inside a kindergarten in Hanoi on June 4, 2025. (AFP)
A grandfather talks to his grandchild inside a kindergarten in Hanoi on June 4, 2025. (AFP)

Vietnam's communist government has scrapped its long-standing policy of limiting families to two children, state media said Wednesday, as the country battles to reverse a declining birth rate.

The country banned couples from having more than two children in 1988, but a family's size is now a decision for each individual couple, Vietnam News Agency said.

The country has experienced historically low birth rates in the last three years. The total fertility rate dropped to 1.91 children per woman in 2024, below replacement level, the ministry of health said this year.

Birth rates have fallen from 2.11 children per woman in 2021, to 2.01 in 2022 and 1.96 in 2023.

This trend is most pronounced in urbanized, economically developed regions, especially in big cities such as Hanoi and Ho Chi Minh City as the cost of living rises.

Tran Minh Huong, a 22-year-old office worker, told AFP that the government regulation mattered little to her as she had no plans to have children.

"Even though I am an Asian, with social norms that say women need to get married and have kids, it's too costly to raise a child."

Deputy Health Minister Nguyen Thi Lien Huong, speaking at a conference earlier this year, warned it was increasingly difficult to encourage families to have more children, despite policy adjustments and public campaigns.

She emphasized that the declining birth rate poses challenges to long-term socio-economic development, including an aging population and workforce shortages.

She urged society to shift its mindset from focusing solely on family planning to a broader perspective of population and development.

Vietnam is also grappling with sex imbalances due to a historic preference for boys. On Tuesday the ministry of health proposed tripling the current fine to $3,800 "to curb fetal gender selection", according to state media.

It is forbidden to inform parents of the sex of their baby before birth in Vietnam, as well as to perform an abortion for sex-selection reasons, with penalties imposed on clinics who break the law.

The sex ratio at birth, though improved, remains skewed at 112 boys for every 100 girls.

Hoang Thi Oanh, 45, has three children but received fewer benefits after the birth of her youngest, due to the two-child policy.

"It's good that at last the authorities removed this ban," she said, but added that "raising more than two kids nowadays is too hard and costly."

"Only brave couples and those better-off would do so. I think the authorities will even have to give bonuses to encourage people to have more than two children."

Vietnam's neighbor China ended its own strict "one-child policy", imposed in the 1980s due to fears of overpopulation, in 2016 and in 2021 permitted couples to have three children.

But as in many countries, the soaring cost of living has proved a drag on birth rates and the moves have failed to reverse China's demographic decline -- its population fell for the third year in a row in 2024.