We have.

We didn't build it.

So we made a model.

And we had a crate built for it.

So we would take the landscape and we would build up the topography.

We built engines so we built 100 different engines over the last two years.

We thought we could build it, so we built it.

We engineered a virus to pick up carbon nanotubes.

We understand our limitations, and we build around it.

We built a huge mathematical model of how a Stirling engine works.

We construct it and we construct those ideas.

And to connect our country after World War II, we didn't build more two lane highways, we built the interstate highway system.

So, we built a model that explains where those fields might have been.

So we didn't use a radar we built a black box that was looking for electrical signals, electronic communication.

And we keep doing that, and build more powerful machines, accelerators for particles.

Women can talk black men ski white men build strong buildings we build strong suns.

But I'm very excited to tell you that last year we did build it it works.

So we built big models.

We build steps. And we build these things that not everybody can use obviously.

And we did that for tens of thousands of neurons, built digital models of all the different types of neurons we came across.

So we built it again.

We built this institution based on social justice, gender equity, this idea of empowering women.

And we've actually built a couple of these, and this is part of a larger robot made out of these cubes.

How do we construct something like this?

Using straw bale construction, creating heat walls.

Now, American copyright and patent laws run counter to this notion that we build on the work of others.

And if we can translate that into our built environment, then there's some exciting potential for the way that we build things.

And if there is one tremendous if there is one great catastrophe about the places that we've built, the human environments we've made for ourselves in the last 50 years, it is that it has deprived us of the ability to live in a hopeful present.

It's a model we built for Bali.

And we built up a series of tools like this.

How we build things can change as well.

And we build the project to the end.

So we built a three stranded model.

This is actually a heart valve that we've engineered, and you can see here, we have the structure of the heart valve and we've seeded that with cells, and then we exercise it.

And so we built a temporary building I'm getting good at temporary and we put a conference room in that's a fish.

On top of this historical foundation, we build our civilization.

So if we say this machine right now that we've made is about one HB, one human brain, if we look at the rate that this is increasing, 30 years from now, there'll be six billion HBs.

We built an application programming interface, which basically means that programmers can write software that interacts with Twitter.

We have built our education systems on the model of fast food.

We don't build this production equipment any longer in the U.S., unfortunately.

Now to put some neurobiological meat on this abstract model, we constructed a simple one dimensional world for our favorite subject, fruit flies.

Your child will live a life ten years younger than you because of the landscape of food that we've built around them.

So we built the first Barefoot College in 1986.

So, we've built this idea of a commons. People are using it.

Green School is a model we built for the world.