Satawal is one half mile long by one mile wide.

And today, you would see this inside the mine, half a mile underground.

The average depth at the top of it is about a mile and a half.

So that's all water under the sea a mile and a half, two miles, three miles down.

The calving face is four and a half miles across, and in this shot, as we pull back, you're only seeing about a mile and a half.

The Highline is an old, elevated rail line that runs for a mile and a half right through Manhattan.

A mile and a half from the surface to two miles to three miles no sun has ever gotten down here.

The fact is, the last mile is the problem, and half the world now lives in dense cities.

And if you're in the half mile radius of where this bomb went off, you have a 90 percent chance of not making it.

They go from eight cents a mile in 2010, to four cents a mile in 2015, to two cents a mile by 2020.

A 12 year old boy runs past sugar cane fields on a half mile journey to the nearest television set in order to watch the game

It's about three miles out of Nairobi, and it's a mile long and about two tenths of a mile wide, where over half a million people live crammed in these little tin shacks, generation after generation, renting them, often eight or 10 people to a room.

A key part of their technical set up was a half mile long length of wire, which was thrown across the rooftops of several houses in Boston.

A small asteroid, say a half mile wide, would touch off firestorms followed by severe global cooling from the debris kicked up Carl Sagan's nuclear winter thing.

That's a 2,000 mile journey.

So we got out and walked, and sure enough, about half a mile, we came over the crest of this hill, and there was a huge gathering of Bedouin with their camels.

Yeah, I'm a million mile flyer.

So in a sense this is an absolute zero carbon, zero fossil fuel electric mile at two cents a mile by 2020.

I walked three fourths of a mile.

We fly about a mile above the surface.

My house is only a mile from here.

Maybe the last mile problem really should be thought of as the last mile opportunity.

Now, a six mile wide rock is very large.

So it's about a mile across, 600 feet deep.

The desert was advancing by a mile or two a year.

But a trained liespotter can spot a fake smile a mile away.

But when I went up on top, it was a mile and a half of wildflowers running right through the middle of Manhattan with views of the Empire State Building and the Statue of Liberty and the Hudson River.

That's what I'm talking about as a last mile opportunity.

So this is what you call a last mile problem.

This is the last mile.

I walked about 1 mile.

But it goes a mile and a half in a straight line, due east into the range, into very interesting territory except that, as you'll see when we go inside in a minute, we were hoping for limestone but in there is just shale.

To give you a sense of scale, this is about a mile wide.

The last mile is, everywhere, problematic.

This river is one mile across.

But this is a five meter telescope has about a quarter mile focal length.

Trawling a zooplankton net on the surface for a mile produces samples like this.

The folks at the Sloan Digital Sky Survey told us last fall they're making the first map of the universe, three dimensional map of the universe that there are probably 700,000 asteroids between Mars and Jupiter that are a half a mile big or bigger.

The fastest woman to ever run a mile did it in 4 15.

And whosoever shall compel thee to go a mile, go with him twain.

The shopping center is one mile ahead.

And these guys orbited a 30 or no, about a 22 mile long asteroid called Eros.

So, how do we tackle the last mile?

I mean, and only one mile is visible.

Today 2010, in volume, when we come to market, it is eight cents a mile.