4/29: Female DNA found on Boston bomb fragment; Calif. struggles with prison overcrowding

      |Sources say female DNA has been found on a fragment of one of the bombs used in the Boston Marathon bombing; Also, California's Proposition 36 relaxes a law that mandates a mandatory life sentence for three-time felons. Now some 3,000 lifers in Calif. Prisons are eligible for release; And, 12-year NBA veteran Jason Collins becomes first male athlete in one of four major U.S. sports to come out during career.

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