We've separated the males from the females.

If there's a male mosquito that you release, and if there's a female around, that male will find the female.

It is much riskier to give a 50,000 dollar loan than it is to give a 500 dollar loan.

A mosquito

Do you give the nets for free to maximize coverage, or do you make people pay in order to make sure that they really value them?

Well, the good news is, people, if they have the bed nets, will use the bed nets regardless of how they got it.

Skeeter Hawk

They're not going to use them, or at least they're not going to use them as bed nets, maybe as fishing nets.

And lakes with fish have more mosquitoes, even though they eat them.

If they don't find a female, then they'll die anyway.

If you give the nets for free, people are not going to value them.

I hate mosquitoes.

So for 60,

And mosquitoes.

A mosquito bit me

However the first thing that I needed was mosquito repellent typography because they were definitely around heavily.

When one dollar's worth of green beans will give you 75 dollars' worth of produce.

And people who got the free one were actually more likely to purchase the second one than people who didn't get a free one.

If you put more sterile males out into the environment, then the females are more likely to find a sterile male than a fertile one, and you will bring that population down.

And the second is a phenomenon that males are very, very good at finding females.

It nearly goes away in the dry season, because there's no place for the mosquitoes to breed.

Bed nets are very cheap.

And the third one is Do free bed nets discourage future purchase?

You don't always use them for that. People fish with them.

This is Aedes aegypti.

How about bed nets?

I got bitten by mosquitoes.

I was bitten by a mosquito.

There's no point in just killing the odd mosquito here and there.

So the males will go out, they'll look for females, they'll mate. If they mate successfully, then no offspring.

They might be able to buy mosquito nets.

One, that people will pay different prices, but the overwhelming number of people will come forth at one dollar per net and make a decision to buy it.

To give you just a couple of examples how fast this has happened, in the mid '70s, Brazil declared, We have no Aedes aegypti, and currently they spend about a billion dollars now a year trying to get rid of it, trying to control it, just one species of mosquito.

So here's a typical situation, male meets female, lots of offspring.

The males have been put in little pots and the truck is going down the road and they are releasing males as they go.

Well, what you can see is that when people have to pay for their bed nets, the coverage rate really falls down a lot.

You then have to introduce the mosquitoes, and you have to model that and how they come and go.

And the answer is this thing.

We got, later, the mosquito netting.

I just got bitten by a mosquito.

You'll get bitten by mosquitoes.

Mosquito and fly, they are big

And if you can put more, I'll call them sterile, that the offspring will actually die at different stages, but I'll call them sterile for now.

And, not only do they protect the people who sleep under them, but they have these great contagion benefits.

You can distribute bed nets, and bed nets are very effective if you use them.