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South Korea’s Yoon Suk Yeol is only the second leader to travel to the U.S. for a state visit during the Biden administration. AP Photo/Evan Vucci

US-South Korea nuclear weapons deal – what you need to know

The ‘Washington Declaration’ unveiled during the state visit by South Korean President Yoon Suk Yeol gives Seoul a greater role in coordinating a nuclear response strategy.
For much of the 20th century, Americans were used to seeing people bearing the signs of past polio infection. Genevieve Naylor/Corbis via Getty Images

‘Got polio?’ messaging underscores a vaccine campaign’s success but creates false sense of security as memories of the disease fade in US

Polio vaccines have been a massive public health victory in the US. But purely celebratory messaging overlooks the ongoing threat if vaccination rates fall.
A class of inhibitory neurons can make long-distance connections across both hemispheres of the brain. akinbostanci/iStock via Getty Images Plus

Cognitive flexibility is essential to navigating a changing world – new research in mice shows how your brain learns new rules

Learning new rules requires the suppression of old ones. A better understanding of the brain circuits involved in behavioral adaptation could lead to new ways to treat schizophrenia and bipolar disorder.
Museum specimens are like time capsules from where and when the organisms and their pathogens lived. Ed Maker/The Denver Post via Getty Images

Leprosy-causing bacteria found in armadillo specimens highlight value of museum collections for tracking pathogens

Museum archives hold biological specimens that have been collected over years or even decades. Modern molecular analysis of these collections can reveal information about pathogens and their spread.
In addition to evaluating new drug applications, the FDA also inspects drug manufacturing facilities. The U.S. Food and Drug Administration/Flickr

Challenging the FDA’s authority isn’t new – the agency’s history shows what’s at stake when drug regulation is in limbo

As the government’s oldest consumer protection agency, the FDA has long butted up against drugmakers, activists and politicians. But undermining its work could be harmful to patient health and safety.
A member of the Ku Klux Klan shouts at counterprotesters during a July 2017 rally in Charlottesville, Va., calling for the protection of Southern Confederate monuments. Andrew Caballero-Reynolds/AFP via Getty Images

White power movements in US history have often relied on veterans – and not on lone wolves

An expert in American history explains the white power movement, its impact on veterans and women and how the Vietnam War was the impetus for extremist groups to gain new members.