Every person I talk to has a story about how their smoke alarm went off or woke them up with a battery beeping. So you take it off the wall and you take the battery out and say screw this. They hate the products.

We're thrilled to join Google. With their support, Nest will be even better placed to build simple, thoughtful devices that make life easier at home, and that have a positive impact on the world.

People buy products, and they want to understand what those things are and how they are applicable to their life.

Learning by doing is the only way I know how to learn.

I'm always doubtful. Everything I do is always doubtful. When you're trying to differentiate, there's going to be this gut sense, is this right? If you're not having doubt, then you're not pushing it hard enough, or you're not looking at the details close enough. You need to be feeling that doubt every single day.

If you're not having doubt, you're not pushing the boundaries far enough.

It's easy to solve a problem that everyone sees, but it's hard to solve a problem that almost no one sees.