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detectors in daycares. it must have shocked you when you found out that there wasnt a carbon monoxide detector at the preschool. what every parent needs to know. and the top-secret j.f.k. assassination files. both a republican and a democratic president pushed off the are the lease. is there something they dont want you to know? >> this is the "cbs evening news" with norah odonnell, reporting from the nations capital. >> odonnell: good evening, and thank you for joining us on this wedn...