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A large metal "X" sign is seen on Friday on top of the downtown San Francisco building that housed what was once Twitter.

'X' logo installed atop Twitter building, spurring San Francisco to investigate

City officials say replacing letters or symbols on buildings requires a permit for design and safety reasons. The installation is part of Elon Musk's effort to rebrand the social media platform.

David Houle is a San Diego resident experiencing homelessness. He's participating in an addiction treatment program that uses Suboxone. Oct. 5, 2023. San Diego, Calif.

San Diego Public Library, Father Joe's Villages work to treat addiction with Suboxone

The School of Social Work at SDSU has partnered with SDPL and Father Joe’s Villages to provide addiction treatment with Suboxone.

A relief carved on a block in a stairway, one of the many exciting artifacts uncovered at Ocomtun in May.

How scientists lasered in on a 'monumental' Maya city — with actual lasers

Light-mapping technology is expediting the pace of archaeological discovery in the dense jungles of central Mexico. The latest find could offer clues about how humans advanced agriculturally.

Graph shows the oscillation between tracks that causes cells to live longer. Undated

Scientists found a way to make yeast cells live longer. What could that mean for our lifespan?

Research at UC San Diego shows that bioengineering can extend the life of yeast cells and probably human cells also.

Cosplayers from a previous Afro Future Con pose in this undated photo.

Afro Future Con returns this weekend

The free, family-friendly event celebrating Afrofuturistic art, film, writing and thinking takes place at Jackie Robinson YMCA in Mountain View.

Students at Nipaquay Elementary School in Mission Valley worked on an experiment to extract DNA from strawberries, Tuesday, San Diego, Calif., April 25, 2023.

It's in your DNA! Students celebrate the anniversary of the discovery of life's most basic genetic code

DNA Day is celebrated across the world marking the 70th anniversary of the discovery of the double strand genetic code.

Godzilla attacks the Golden Gate Bridge in <em>Monarch: Legacy of Monsters.</em>

Why does Apple TV+ have so many of the best streaming shows you've never heard of?

People may grumble about Apple's higher monthly fee, but there are a lot of original series packed in their lineup that many viewers haven't yet considered.

A rural mail carrier in 1905 trying out new transportation technology.

Horseless carriages were once a lot like driverless cars. What can history teach us?

Historians say that a little more than a century ago, when cars first hit the roads, they caused nervous laughter and raised real concerns, much like driverless vehicles today.

Ekemeni Riley is the managing director of Aligning Science Across Parkinson's, a research initiative that worked on an effort to bring a more diverse population into a study on genes that carry a greater risk for the disease. A team that included scientists from Lagos, London and the U.S. found a previously unknown gene variant that can nearly quadruple the risk for people of African ancestry.

Risk factor for Parkinson's discovered in genes from people of African descent

An effort to diversify genetic studies has led to a discovery about Parkinson's disease in people of African descent.

Tissue-resident T cells, colored blue, are seen in an intestine in an undated photo.

Charged up T cells take on tumors in UCSD lab

Scientists learned how to boost the energy of the immune system’s first line of protection. It could help our bodies fight off cancer.

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