The Samsung Galaxy S8 hits stores today, with its makers hoping it'll make you forget about the iPhone and that other Samsung phone with exploding batteries. Geoffrey Fowler, personal tech columnist for the Wall Street Journal, stopped by tell us all about the new device's features, and how it compares with Apple's products. Afterwards, we'll check out the rise of tech in Phoenix, Arizona, and then play this week's Silicon Tally with NASA's Daniel Lockney, whose job includes helping NASA technology find uses in places here on earth.