John Hamilton

Now the FDA says it's working with the drug company Pfizer to import tablets that are made in Spain and sold in Canada but are not approved in the U.S.

John Hamilton, NPR News.

In 2017, the journal Science Signaling published a study suggesting one specific form of the protein amyloid beta played a key role in Alzheimer's disease.

The study's senior author was Sylvain Lenné of the University of Minnesota.

Teams at other institutions were unable to replicate the finding, though.

And by 2021, scientists on the website PubPure were alleging that the data in the study had been manipulated.

In 2022, Science Signaling published an expression of concern about the study.

In March of 2025, Lanais resigned from his university post after an investigation raised concerns about the data in several of his studies.

And this week, the journal retracted his paper.

John Hamilton, NPR News.

And I'm Giles Snyder.

This is NPR.

A natural hand doesn't need much guidance.

Just think about picking up that cup of coffee and subconscious circuits in the brain and spine take care of the details.

So researchers at the University of Utah set out to make a bionic hand that could mimic some of those circuits.

The result is a system that uses machine learning to help a person carry out a task.

And Marshall Trout says it worked in a study of four people who tried to use the bionic hand to drink from a cup.

Without the machine assistance, the person just crushed it or dropped it every single time.

But when participants got help from the system's machine learning function, they were able to bring cup to lip without a hitch.

John Hamilton, NPR News.