Google co-founders retire — Zume robot pizza aims for $4B valuation — Roku’s ratings drama

Summary: Google’s legendary co-founders are stepping down effective immediately, but it’s probably because Google’s had its most controversial year in ever. Our “Unicorn of the Day” is Zume whose robot pizza is already worth $2B, and it sells the most intense food trucks you’ve ever experienced. And Roku stock plummeted and then surged after two analysts gave opposite interpretations of its streaming potential.