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Texas woman pleads guilty to sending ricin to Obama

A Texas woman and former actress pleaded guilty Tuesday to sending ricin-laced letters to President Barack Obama and New York Mayor Michael Bloomberg, under a deal that her attorney has said would cap prison time at 18 years.

 
Students’ robotic arm can make you stronger

Need a hand lifting something? A robotic device invented by University of Pennsylvania engineering students can help its wearer carry an additional 40 pounds.

 
Congress renews plastic gun ban just in time

Congress’ easy renewal of an expiring ban on undetectable plastic guns belies the larger reality that one year after the horrific school shooting in Newtown, Conn., major new firearms restrictions have little chance of enactment anytime soon.

 
World leaders, South Africans honor Mandela at memorial service

U.S. President Barack Obama exhorted the world Tuesday to embrace Nelson Mandela’s universal message of peace and justice, electrifying tens of thousands of rain-lashed spectators and prompting a standing ovation by scores of heads of state in a South African stadium.