Every time I walk into my kitchen, a small picture of my face pops up on in the top-right corner of the Nest Hub Max's 10-inch screen. If it's the first time it has seen me on any given day, it automatically displays the weather forecast. If I ask it for my appointments, it knows which calendar to look at. All of this works, in part, because it can see me. The built-in HD camera on the front of the $229 Nest Hub Max knows what I look like, thanks to a little training session during setup and now it's constantly on the lookout for my mug, whether I'm doing dishes in the evening or wondering how many Halloween Oreos I can eat before anyone gets suspicious.