Blockbuster video store is seen on November 6, 2013 in Miami, Florida. Blockbuster announced today that it will close its 300 remaining U.S. stores by early January.  - 

It's quiz time on Marketplace Tech. 68 miles above the Earth, 300 stores, $300, 100 million people: Can you guess what these numbers mean?

We put Leslie Horn, staff writer for Gizmodo, to the test for our latest edition of Silicon Tally. Click on the audio player above to play along

Follow Ben Johnson at @@TheBrockJohnson