Alex Cohen
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Kira Roessler and Mike Watt first emerged as the bassists of two massively influential punk bands, Black Flag and The Minutemen. But on and off for three decades, they've joined forces as a bass-only duo called Dos.
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Hundreds of women are taking part in a revival of one of America's most violent sports: roller derby. Alex Cohen of NPR station KQED, and a member of the L.A. Derby Dolls league, reports.