Airing on Friday, January 23, 2015: Your walls don’t have ears but they may have eyes – police are now using radar technology to scan for people inside their homes. We talk to Marketplace reporter Stan Alcorn to find out if that is as creepy as it sounds. And how well have you kept up with the week in tech news? Today, we’re also joined by Harry Campbell, who blogs as The Rideshare Guy, to play Silicon Tally. And then we talk to Laura A. Ackley, historian and author of “San Francisco’s Jewel City: The Panama-Pacific International Exposition of 1915,” about the first transcontinental telephone call ever made. It was 100 years ago this Sunday.