How many human cells does a pig need before it’s considered too human?

Putting pig organs in people is OK in the US, but growing human organs in pigs is not – why is that?

It’s normal for parents, or anyone, to have questions about vaccinations -- but what happens if your pediatrician urges a shot that’s under attack by the Trump administration?  The revolt by pediatricians, obstetricians, family physicians, infectious disease experts and internists came to a head when an advisory panel handpicked by Health Secretary Robert F. Kennedy Jr. urged an end to routine newborn vaccination against hepatitis B, a virus that can cause liver failure or liver cancer.

What are parents to do as doctors clash with Trump administration over vaccines?

Photos of the interstellar comet 3I/ATLAS show it traveling through our inner solar system. The growing collection of images has fostered intrigue around the mysterious object.

Interstellar comet 3I/ATLAS' journey through our solar system, in photos

Voyager 1, NASA’s deep-space probe, could soon become the first spacecraft to reach a historic milestone. In November 2026, the probe will be one light-day from Earth.

NASA's Voyager 1 set to achieve historic distance from Earth

The European Space Agency said that the black hole inside the spiral galaxy NGC 3783 has the mass of 30 million suns.

Astronomers detect black hole blasting winds at incredible speeds

Denny's diner chain is closing many of its stores around the United States.

Denny's is shutting down restaurants around the country. What's behind the closures?

Architect Frank O. Gehry, who designed unique buildings across the globe, has died.

Architect Frank Gehry has died: See his most iconic buildings

The Baja Blast pie from Taco Bell arrived at the fast food chain on Thursday.

Taco Bell debuts its Baja Blast pie, and the reactions may surprise you

Former Twitter CEO Jack Dorsey created a new app called diVine after shutting down Vine in 2017.

What to know about Jack Dorsey's new Vine revival, DiVine

Customers send their telescopes to Starfront Observatories, where amateur stargazers can view the night sky unencumbered by artificial light.

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Denny's is shutting down restaurants around the country. What's behind the closures?

Architect Frank Gehry has died: See his most iconic buildings

Architect Frank Gehry has died: See his most iconic buildings

Taco Bell debuts its Baja Blast pie, and the reactions may surprise you

Taco Bell debuts its Baja Blast pie, and the reactions may surprise you

What to know about Jack Dorsey's new Vine revival, DiVine

Remote telescope farm offers clear views for stargazers

Starfront Observatories: A haven for distant stargazers

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