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It seems the setting for the cards (Google Now widget) is accessed via the Google screen that opens when you tap the card. I did not have the widget on my screen, so i did an upward swipe from the bottom to bring up the Google screen and also did it via the widget.
Once there, at the top left is the main settings icon. Tap that, and you can choose "customize" to add or remove different types of information Google will use to keep you updated (in your "stream").
You can also tap "Settings" instead and and look for "Now cards" to change how it works AND to turn on or off different categories of notifications.
Hope that helps
I see under "Settings" a setting titled "Now Cards" and a section titled "Get Notified About" with on/off buttons for "Weather", "Commute and time to.. ","Sports","Stories and Videos" & "Places".
I don't know if turning off "Stories and Videos" will stop that, but it's something to try.
