Microwave some popcorn, then open the fridge, and pour yourself a drink.
If Ph.D. student Gierad Laput has his way, each of those things you just did will be recognized by a single sensor in the room. And the applications are endless.
He and his team went way behind the increasingly common "smart home" or "smart office" of today's Internet of Things. Check out this video he and his team created at Carnegie Mellon University: