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People sit around laptop computers at a cafe. - 

$4.7 billion. $20,000. 6 seconds. 890 billion: Can you guess what these numbers mean?

We put Amy O'Leary, technology reporter for the New York Times, to the test for our latest edition of Silicon Tally

And check out Amy's piece about the new genre of 'lyric videos' here.  

Click on the audio player above to play along. 

Follow Ben Johnson at @@TheBrockJohnson