May 22, 2013 11:15 PM EDT

• FBI arrest 37-year-old in ricin letter investigation
• Vt gov signs novel law against false patent claims
• FBI: Arrest made in Wash. ricin scare last week
• Ex-PSU prez seeks dismissal of criminal charges
• Surgeons remove tiger's basketball-sized hairball
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• Vt gov signs novel law against false patent claims
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• Illinois Wesleyan fraternity suspended after student's death
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• FBI arrest 37-year-old in ricin letter investigation
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• Chicago Board of Education votes to close 50 schools
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