Now I'm going to step back in history.

And then time here, from 1858 I start the world.

It goes back to, you know, the real real versus the fake real.

Back in 1995, we got a new wing next to the museum.

You gradually trace further and further back into the past, adding these ever more distant relationships.

And of course, our thermometers only take us back 50 years or so here.

And so it all started several years ago, late one night when I was sitting on the subway, riding home, and I was thinking.

And what we found after drilling back in time two to 400 years was that these were unique events.

Now over the last couple of years, we've gone back to the tree of life because we wanted to find ways to turn circuits in the brain off.

We used to do it just with ice cores, but in this case, we're going back 20 million years.

You can decode the genome, you can look back, you can link us all together by a mitochondrial DNA, but we can't get further than the last ancestor, the last visible cell that we could sequence or think back in history.

Well, we found that as you look back in time, the universe gets hotter and hotter, denser and denser, and simpler and simpler.

And I think once we ask that question we have to go back, actually, to life. Because obviously, if we keep extending the origins of technology far back, I think we come back to life at some point.

If you look at the origins of this, the classic history sort of takes it all back to the ENIAC here.

I channel their history so that they have a place to go back to look at their life and its possibilities.

So we drill back in time to see how often that's happened, and exactly how fast that ice can melt.

You have to go back about 30 million years to find a time when CO2 levels were double what they are today.

5220 Prior surveillance

Remember, this tradition comes to us not from the mists of Avalon, back in time, but further still, before we were scratching out these stories on papyrus, or we were doing the pictographs on walls in moist, damp caves.

Article 4

And this chart goes back to 1500.

the principle of non retroactivity of laws

Through my work, I've been trying to find ways to harness and unveil this.

And here's the thing you have to go back about 15 million years to find a time when CO2 levels were about what they are today.

We're going to come back to that in a few minutes, and I'm hoping that if you learn to tweak this a little bit, it could significantly change the way your life unfolds.

We can see all the way out to the edge of the observable universe, all the way back in time, almost to the moment of the Big Bang itself.

But we get these instrumental and near instrumental quality records of temperature change that go back hundreds of years, and we put them together.

We just want to go back and find out more.

It all started back in 2001.

Let's go back before Christ, three millennia, to a time when, at least in my head, the journey for justice, the march against inequality and poverty really began.

And what we try to do in astronomy and cosmology is to go back before Darwin's simple beginning, to set our Earth in a cosmic context.

I mean, the story I tell is that I got mad at postmodernism at po mo and said that fish were 500 million years earlier than man, and if you're going to go back, we might as well go back to the beginning.

It goes all the way back to Aristotle.

All these things, they come back to plants.

Their history actually goes back to about the time of Christ.

They go back about two and a half million years.

Most Americans are descended from immigrants.

According to Iraq, Jordan had already made plans to address depletion and deterioration of its groundwater resources before the conflict.

They want to go back to its roots and make conscious hip hop popular again.

The old church on the hill dates back to the twelfth century.

The first tunnels date back to 60 B.C.

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The obligations undertaken by NPT States Parties cannot be retrospectively forgotten to ensure confidence in the Treaty, we must respond decisively to non compliance.

These are animals whose lineage dates back about 100 million years.

It goes back to a time when I was very often staying in hotels.