What makes the Mona Lisa — or any piece of art — successful? Sergio Velayosf/Flickr hide caption

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A view of Venus, black dot at top center, passing in front of the sun during a transit in 2012. A quarter of Americans questioned failed to answer correctly the most basic questions on astronomy. AP hide caption

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Brother David Steindl-Rast says taking even just a moment to be grateful will make you happy. James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

TED Radio Hour

David Steindl-Rast: What Does It Take To Be Grateful?

Benedictine monk David Steindl-Rast on slowing down, looking where you're going and being grateful.

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Graham Hill says we need to declutter our lives. James Duncan Davidson/TED hide caption

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