NPR National Stories

A new report finds the U.S. birth rate has dropped to its lowest level on record, led by a dramatic decline in births among immigrant women. The trend has been visible at La Clinica del Pueblo, a nonprofit in Washington, D.C., that holds a weekly neonatal clinic.

Robert Siegel talks with UT-Austin astrophysicist Karl Gebhardt about his team's discovery of a giant black hole in a tiny galaxy. The discovery contradicts traditional theories of galaxy formation.

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MELISSA BLOCK, HOST:

Mississippi River water levels are reaching near-record lows. Sections of the middle Mississippi River may become obstructed in December by rock outcrops in southern Illinois. The Army Corps of Engineers plan to remove the rock pinnacles in February, but river navigation industry leaders say that's not soon enough.

The popular website Intrade allows its users to bet on the odds of almost anything — like whether Syrian President Bashar al-Assad will get ousted by a certain date, or whether the movie Argo will win best picture at the Oscars.

This week, Ireland-based Intrade announced that U.S. users will have to unwind their bets and shut down their accounts by the end of the year. That's after the Commodity Futures Trading Commission sued Intrade for operating an unregistered exchange.

Facebook has a long history of upsetting its users by suddenly announcing a change to its privacy settings. In 2009, as a way to quiet the critics, Facebook set up a system for its customers to vote on changes. If enough of them were unhappy, the company would back down. Now, Facebook wants to get rid of the voting.

The Senate Judiciary Committee approved legislation to make old emails a little more private on Thursday. The legislation also applies to old Facebook posts, Google documents and anything else you might be hiding online behind a password.