Catalyst: The dirty little secret of soaps

The Food and Drug Administration may have banned the sale of healthcare products containing triclosan and triclocarban, but those same chemicals that compromise our immune systems still exist on store shelves and remain a serious threat. How do researchers know? They are looking at the bio clues that we are flushing down our toilets.

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Enjoy 14 concerts in Arizona PBS Passport Summer Series

Beginning Aug. 1 your Arizona PBS Passport membership is also your front-row seat to 14 legendary concerts this summer.

"Sherlock" returns for an encore of Season 4

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