Meanwhile, the other leg draws a wide circle, constantly moving.

(Music Wenlenga Various artists)

And Roots and Shoots is a program for hope.

Back to your roots.

It tells you a lot about the music you hear

(Laughter)

You can do a very simple test scrape your cheek send it off.

I beg that you pick up that brochure.

Sometimes it's a global view, to see our common roots and how we can use them to catch dreams.

I'd been making games for 20 some years, and then I decided to do it again.

My history is Irish.

It goes back.

And, just a little terminology, these are also called the zeroes, or the roots, of f of x.

This cell phone started its trajectory in an artisanal mine in the Eastern Congo.

It's up to us to change things so that the poor have choice as well.

Pretty straightforward.

I feel this deep shame, and that's why in 1991 in Tanzania,

We not do have more than this one planet.

But oh, they're also working on HlV AlDS.

I'm going back home. I need to get in touch with my roots.

She was in the leadership in Dar es Salaam.

Suddenly we had a way into the conversation.

There are crisis maps, election maps, corruption maps, and even environmental monitoring crowd maps.

I feel this desperation.

And you just factor this quadratic. x plus 3 times x minus 2 equals 0.

We have this program in prisons as well.

So the optimal temporal mix is what you get from the past past positive gives you roots.

And if we were to factor this, we get x plus 7 times x minus 4 is less than 0.

Once or twice a year I'd go an' work at 'em a bit prune 'em an' dig about th' roots.

Because he said, watashi wa Kangoku jin desu , it was because he took pride in his roots

You pretty much just have to try number in between the roots, and try number outside of the roots, and that tells you what interval will make the inequality true.

So, if I had something like f of x is equal to x squared plus 4x plus 4, and I asked you, where are the zeroes, or the roots, of f of x.

I cannot see that there is anything very funny, cried our client, flushing up to the roots of his flaming head.

And when you watch bonobo play, you're seeing the very evolutionary roots of human laughter, dance and ritual.

As I travel around the world 300 days a year, everywhere there's a group of Roots and Shoots of different ages.

So this is, right here, x is at minus 3y0 by definition one of the roots is where f of x is equal to 0.

If you draw it visually and this is the parabola, this is f of x, the roots here are minus 7, 0 and 4, 0, we're saying that for all x values between these two numbers, f of x is less than 0.

And now I'm going to give you one of the few things in math that's probably a good idea to memorize.

And I hope that some of us can get together and talk about some of these things, especially the Roots and Shoots program.

I met her today.

It's the Mecca of house music. it's DJ paradise.

It's a project that now reaches across three continents, and its roots go into the fields of mathematics, marine biology, feminine handicraft and environmental activism.

But basically, we have programs now from preschool right through university, with more and more adults starting their own Roots and Shoots groups.

Another great way to tell your story is to tell your children where they came from.

So I'm really grateful for this opportunity to share this message again, with everyone at TED.