A pile of Bitcoins are shown here after Software engineer Mike Caldwell minted them in his shop on April 26, 2013 in Sandy, Utah.
A pile of Bitcoins are shown here after Software engineer Mike Caldwell minted them in his shop on April 26, 2013 in Sandy, Utah. - 
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Marketplace

It's time for Silicon Tally. How well have you kept up with the week in tech news?

This week, Luis von Ahn, professor of computer science at Carnegie Mellon University and the CEO of Duolingo,  talks tech and takes the test.

Play along at home, below.

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Follow Ben Johnson at @@TheBrockJohnson