As clever as Google's OnHub routers are, they've had a few glaring omissions... like, say, a guest mode to accommodate your friends. However, the company is making amends for at least one of its rookie mistakes. It's readying an update that enables guest WiFi, which lets visitors hop online without giving them access to absolutely everything on your local network. You also have fine-grained control over the devices you do want them to see. You can open up your Chromecast, for example, while keeping your networked storage off-limits.