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America has a tiger problem
There are more tigers in captivity in America than there are wild tigers left on earth. Owners say the big cats are happier here, but are they? The Smithsonian’s Max Kutner reports.
Reading, writing, berries! School gardening03:59
The fight against oil drilling in the Gulf03:49
Transforming trash into incredible tiny homes05:04
Parts of Patagonian glacier collapse00:46
How land grabbing could affect parks07:08
How religion clashes with science06:41