Over millions of years, variation and selection, variation and selection trial and error, trial and error.

It's still being tested.

And it takes a lot of trial and error.

Don't feel that there should be a way that you can just always power through these problems.

Well Tim, it's kind of obvious.

Trial and error is essential to progress.

(Applause)

You just need to say that right.

And we're still trying to keep with the real character.

So, it was back to the drawing board for us.

I sometimes wonder.

Some Swedes very kindly classified a lot of their infant deaths according to the British register of general socioeconomic classification.

It didn't come because you put some incredibly smart person in charge.

And then I'm going to show you it's actually a lot more complicated.

And it has been for 50 years an experiment.

When schools stop doing that all the time,

Our motto is, 'Fail early and fail often.'

It's really helpful. This is my first time teaching a class.

These are the kinds of lessons as awkward as it was to be a pretty goofy teenager, much worse to be a frustrated designer.

And I'm going to show you a bunch of dead ends, basically.

But the art form is quite different than it used to be.

Now I'm still eager to reach an agreement based on the principles of my bipartisan debt commission. No party has a monopoly on wisdom.

Your mother? Yeah.

Here's an example.

Moving along, what about the area of a triangle?

It's like it's studying the buildings, trying to figure them out.

Finding a solution that worked was a process of trial and error.

Through trial and error, he found the right answer by chance.

RG I'm sorry.

Scorpions follow prey out of the sea. Slugs became snails.

It took about ten years for me to be aware of this and get the right way.

Do you remember when we were kids at school, about that big, they played the same trick on us?

So we, by making a whole bunch of attempts, thousands of attempts, in that four year time period, we invented the concepts of the airplanes that we fly today.

I became increasingly fascinated by the diversity of life.

So he asked me, could he please visit me, and then finally he did, and explained to me that what I did now in my shop was an anachronism, that the industrial revolution had broken out, and that I rather should join the factory.

It's a branch in the plan, so what we do is we search through this tree.

let's have a systematic way of determining what's working and what's not you can solve your problem.

And that's the way, ultimately after some ups and downs,

Now you show me a successful complex system, and I will show you a system that has evolved through trial and error.

There's a lot of research and a lot of failure, trial and error I guess, more error that goes into each and every dish, so we don't always get it right, and it takes a while for us to be able to explain that to people.

Information can't be found anywhere, so I created a manual myself through trial and error.

Sometimes she loses track of time.

When her cat died, Diana went to pieces.

These troubles are sometimes misdiagnosed as the end of innovation, but they are actually the growing pains of what Andrew McAfee and I call the new machine age.

Sometimes you can look at this first digit and look at the first digit here and make an estimate.