That was when it got like everything was contagion.

There's emotional contagion that takes place in human populations.

And, in fact, emotional contagion can be broader still.

Usually when people talk about influence they also talk about contagion.

There's new research out of Harvard Medical School about social contagion.

In humans, of course, we can study that with yawn contagion.

Even a thousand years from now if the contagion should reappear.

The evil contagion is like the plague. Worse than the black death.

Of death, contagion, and unnatural sleep A greater power than we can contradict

It's what I call social contagion, and it's really powerful and really exciting.

Also, we know that people who have a lot of yawn contagion are highly empathic.

People who have problems with empathy, such as autistic children, they don't have yawn contagion.

On the Y axis is the cumulative instances of contagion, and on the X axis is the time.

That actually is the true nature of the distribution of humor when you don't have the contagion of humor.

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

If half of a community sleeps under a net, the other half also benefits because the contagion of the disease spread.

For example, anything that spreads by a form of social contagion could be understood in this way, from abstract ideas on the left

So yawn contagion that you're probably all familiar with and maybe you're going to start yawning soon now is something that we share with other animals.

And we see this when lovers walk down the street, when a crowd in Egypt or Tunisia gets caught up in an emotional contagion, the deep interpenetration.

Societies should be willing to go out and subsidize the net, give them for free, or, for that matter, pay people to use them because of those contagion benefits.