Reporting in Science, researchers write of an experiment in which rats worked to open the cages of trapped rats, but not empty or dummy-filled cages. Author Peggy Mason discusses empathy in non-primates, and the value rats place on freeing a companion--about equal to that of a stash of chocolate chips.
Adult Burmese pythons can swallow prey as large as deer. Now, researchers from the University of Colorado, Boulder say the way the python's heart balloons after it eats could help treat human heart disease. Molecular biologist Leslie Leinwand discusses her team's python experiments.
The campus of Virginia Tech in Roanoke, Va. was on lockdown Thursday after a gunman killed a police officer during a traffic stop, and one other person. Campus officials instructed everyone to stay in a secure place indoors and barred visitors while police continued their search for the shooter. Virginia Tech established a number of security and emergency response measures after the 2007 mass shooting that killed 33 people. Mallory Noe-Payne, intern with NPR member station WVTF in Roanoke provides an update.
NPR's Debbie Elliott and Richard Gonzales spent a month on the road across the nation, reporting stories of economic struggle for the NPR series "Hard Times." They heard stories of people and places grappling with economic hardship, and also found a few bright spots along the way.
As the Euro crisis continues, Germany and France have proposed reforms to give European Union leaders more power to demand fiscal discipline from member states. The crisis has raised difficult questions about national sovereignty for many EU member states.