This mass suicide was actually discovered by a documentary crew here

No other species can do that.

I mean all these guys are killers, aren't they?

And many of you were doing what great, if you will, tribal leaders do, which is to find someone who is a member of a tribe, and to find someone else who is another member of a different tribe, and make introductions.

In order to survive Humans have had to organise themselves.

I never get to grow up with a family with bikes and candy.

A bunch of dirt?

I heard it's a pretty bad outbreak.

You're all a member of tribes.

Size of the total population

They all disappeared!

Now, the reason we knew that was because we spent the previous 10 years studying tribes, studying these naturally occurring groups.

You do find groups in the animal kingdom you do find cooperative groups but these groups are always either very small or they're all siblings.

And we have to duke it out every day, so we resort to politics.

Well, what do you think i've got here now?

English Subtitles by T. Kameneva

See, people who build world changing tribes do that.

Well, if that's true, a couple other things had to be true as well.

Population size

I think I feel a little full. The next movement is called mobs.

The Persian warrior elite.

Human beings are like that.

It increases gloating.

The third is what you might call sympathy, the ability to work within groups.

Number of success overall

So I decide to replace Francois Fillon

People forget that. People think of trade as a modern thing.

Is nothing sacred anymore, for heaven's sake?

It's a whole race of people no bigger than ants.

But the good news is they are out there.

We had no idea

English Subtitles by T. Kameneva

Fourth, students must stop traveling in packs.

So for example, there was one study that was done in a population of Ashkenazi Jews in New York City.

So look at it this way

You're vigilantes.

You're headed for more trouble than you can possibly understand, Sean.

You can do it. So Paula Radcliffe, unfortunately, does it.

However, not everyone understood the importance of our mission.

And I got my daughter's Barbie doll dish,

It's gangs like

You turn up the dials, the wheel starts to turn.

They're gonna cooperate now.

The group, not the individual.

The first time I bring a group...