Now with 50 percent less Bitcoin: This week's Silicon Tally

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

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.

About the author

Ben Johnson is the host of Marketplace Tech.

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