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Before he was a journalist, NPR science correspondent Joe Palca studied psychology, and focused on sleep research. He found it frustrating to study sleep: Though there are many questions about why and how we sleep, scientists have very few answers.

Russia announced this week that it would no longer work to disarm nuclear and chemical weapons under the U.S. program known as Nunn Lugar. This was a very successful program that reduced Russia's stockpiles of weapons of mass destruction over the past 20 years. U.S. money and expertise drove the program, but now the Russians believe they have plenty of both to continue the job on their own. NPR's Mike Shuster reports.

New and higher tariffs are set to take effect this week, amid signs the president's economic policies are resulting in higher prices and slower economic growth.

Ukrainians say peace can't be achieved in their war with Russia without Ukraine being involved. Yaroslav Hrytsak, a historian at Ukrainian Catholic University in Lviv, talks about what options Ukrainians think they have.

Republicans in Texas have released a proposal for a new state congressional map. President Trump has said he wants a map that helps his party win five more House seats in next year's midterms.

Russian President Vladimir Putin has praised Donald Trump's "energetic and sincere" efforts to end the war in Ukraine. But on the streets of Moscow while many hope for an end to the war, they disagree on how to get there.

The National Transportation Safety Board opened a three-day investigative hearing Wednesday on the January midair collision near Ronald Reagan Washington National Airport, which killed 67 people.

A bipartisan coalition has joined forces to push aggressive new sanctions on Russia and believe the souring relationship between President Trump and Vladimir Putin has created a new opening.

The Women's Health Initiative, begun in the 1990s, has made many important discoveries. Now funding to collect more research data will end in September.

Researchers from Rice University imaged the magma underneath Yellowstone and showed how it vents pressure, reducing the likelihood of a massive eruption anytime soon.