Others battle oppressive societies.

'This spring was the first I felt tired, and realised I was ageing.

How can we understand what makes some societies more fragile than other societies?

Data powers high tech societies.

In primitive societies barter was used.

land animals, plants, and human societies.

Our ancient societies all valued organ meat.

In medieval societies there were defined allegiances.

lives in the societies without independent press.

How do we make stable societies? Longevity.

Human societies got larger, denser, more interconnected.

And you have more choice driven societies.

So, I'm looking at these issues of collapses for a lot of past societies and for many present societies.

Kids do worse in the more unequal societies.

We know our societies have to radically change.

The official dogma of all Western industrial societies.

Without ground water, our societies would be parched.

Because those who aspire to democratic culture are in power, or have societies that are leading globalized, powerful societies, powerful countries.

Products made from petroleum are vital to modern societies.

I study Muslim societies around the world at Gallup.

People are living longer and societies are getting grayer.

Anthropologists have found evidence of romantic love in 170 societies.

There's no life without it for ecosystems, societies, and individuals.

Problems that have plagued societies for centuries solved almost overnight.

What's changed is we now can look at the evidence, we can compare societies, more and less equal societies, and see what inequality does.

International aid and development has been going on for years, but extremism in those societies, in many of those societies, has been on the rise.

But nevertheless, there are certain common threads that emerge from these comparisons of past societies that did or did not collapse and threatened societies today.

The fourth item on my checklist is relations with hostile societies.

And, again, civil societies breathing down the neck of the establishment.

These societies are the Ibo, the Somali, the Kikuyus, for example.

Societies, cultures can be improved through... careful manipulation of historical events.

Now I'm going to show you what that does to our societies.

And it's likely why as societies become more affluent, their health declines.

These new societies required that members be active researchers publishing their results.

So, some societies, for subtle environmental reasons, are more fragile than others.

South Korea built one of the most patriarchal societies we know about.

It's within these tribes that societies get built, that important things happen.

What will happen to societies that are top heavy with older people?

We cannot change these societies, but we can help the people in these societies who are struggling and usually failing, because the odds are so stacked against them.

But there is another part that we must together rebuild, to build our societies, our modern family of societies, we are at a point where we cannot go back.

The history of all hitherto existing societies is the history of class struggles.

The poorest and most backward societies are always those that put women down.

So income means something very important within our societies, and nothing between them.

But in the more equal societies, it rises to 60 or 65 percent.

There are four societies the Kogi, the Wiwa, the Kankwano and the Arhuacos.