10th 1 just wasn't telling the two.

I'm Carla Zeus for CNN.

10.

It's great to see you today.

First story takes us to the largest country in South America, where a mystery is washing up along Brazil's coast.

Crude oil.

Hundreds of tons of it has appeared on Brazil's northeast beaches.

This has been going on since early September.

Roughly 1200 miles of shoreline have been polluted.

The mystery here is where it came from.

No one knows yet.

Brazil's government has tested the oil, and officials say it did not come from Brazil.

They believe it's from Venezuela, but they didn't directly blame Venezuela for the spill.

Brazil's environmental minister says it might or might not have been an accident.

It could have come from another country's ship, for instance, that was carrying Venezuelan oil.

Venezuela says it's not responsible.

Natural oil spills when the substance simply seeps out of the ocean floor are possible.

But Brazil's president thinks this could have been a criminal act, whoever or whatever is to blame.

Thousands of volunteers and government workers have been doing what they can to clean up the coast.

Environmentalists are concerned about the oil's effects on the coral reefs in the area, and officials say a number of birds and sea turtles have been found dead in the slick.

Critics of Brazil's government say it hasn't done enough to address the spill.

Earlier this week, it said it was sending 5000 more members of the military to help out because people there don't know where the oil's coming from.

They can't say for sure whether the spill is getting worse or better.

Officially, the Pacific nation of Japan has had a new emperor since May, shortly after Emperor Akihito abdicated or gave up his throne.

But it wasn't until this week that his son, not a Ito, made his enthronement and that of his wife.

Official.

This is the ceremony in which a new Japanese emperor proclaims his status to the world.

It's a centuries old tradition filled with rituals and attended by more than 100 high ranking officials from around the globe.

And it's all for a position that's mostly ceremonial.

Japan is officially a parliamentary constitutional monarchy, though its emperor is a symbol of the country and the unity of the Japanese people its decision making powers in the hands of elected politicians.

Of course, some of them were also at the ceremony.

Will Ripley explains the event.

The curtain opens on Japan's Daiwa.

The Era of Beautiful Harmony.

From atop a pavilion in Pine Hall, the most prestigious place in Tokyo's Imperial Palace, Emperor Hirohito officially declares his enthronement, always wishing for the happiness of the people and the peace of the world.

The visuals are very impressive today, the taking of the Throne 1000 year tradition, but it's what they will do, going forward with this message of promoting peace, promoting happiness.

This is the ray watch era that we have anticipated and that they're going to fulfill.

Adorned in £30 robes styled centuries ago, the new emperor and Empress Masako are a surprisingly modern couple.

He went to Oxford.

She went to Harvard.

Both speak English, perfect for hob knobbing with dignitaries from 174 countries, including Britain's Prince Charles, who also attended the enthronement of Emperor America's Akihito in 1990.

Akihito abdicated more than five months ago and did not attend today's enthronement, keeping the spotlight on his son, Prime Minister Shinzo Abe, briefly put politics aside, shouting thief before resuming an exhausting schedule of at least 50 bilateral meetings with leaders from nearly every corner of the world.

Okay, this is perhaps Japan's biggest moment in the global spotlight until next summer's Tokyo 2020 Olympics.

Will Ripley, CNN Tokyo You.

Which of these historical figures might not have actually existed King Arthur ST Patrick, Alexander the Great or Joan of Arc?

Everyone here is historically well documented, except Britain's legendary King Arthur.

Legend has it that on Lee Arthur as a boy was able to draw the magical sword from the stone indicating he would be king and a real life sword in the stone was recently located in a river in the European country of Bosnia and Herzegovina.

It's been called Excalibur like a weapon from the Arthurian legend.

No one knows how the sword got stuck in Iraq about 36 feet below the water surface, it was reportedly found, while archaeologists were investigating a medieval castle nearby because they believe it dates back to the 13 hundreds, and because it was stuck in a stone, it wasn't easy for them to separate it and bring it to dry land there aren't a lot of medieval swords found in this part of the world.

The last one was located 90 years ago.

So researchers air hoping to learn more about the region's history from the modern discovery.

We have an update for you today on the work of a CNN hero named Amanda Box tell.

In the early 19 nineties, she was paralyzed in a skiing accident and told she wouldn't walk again.

But in the decades that followed box tells been able to go skiing, mountain biking and parasailing, thanks in part to technology and physical therapy.

The thing is, hi tech therapy like this is expensive, she says.

Some of it can cost $90,000.

So Box Tell Started, a nonprofit organization called Bridging Bionics, to help people with mobility issues get treatment they otherwise might not be able to afford.

Here's an example of how it's working for so many people.

Jumping rope is a regular part of their workout routine.

But for Nate White, jumping rope is stunning achievement.

Three years ago, Nate compressed his spine and broke his vertebrae in a kayaking accident.

He was told he'd never walk again, but then he met CNN hero Amanda Box tell she and her nonprofit Bridging Bionics help get Nate back on its feet.

They're free or low cost therapeutic sessions and access to cutting edge technology was a game changer.

This type of technology, it's not easily accessible.

It's not affordable.

Why not?

When I got out of the hospital, my insurance company gave me 10 hour long physical therapy sessions for the year.

I do 10 physical therapy sessions in a week, stretching need Thio keep making progress and there's a teacher that just wasn't financially possible for me.

It's about a year behind my right.

Nate regained function in his right leg first, followed by his left.

Today, he's not just walking but running, mountain bike, playing basketball and, yes, even kayaking.

Amanda took me under her wing.

She always believed that I was gonna be walking.

He's living the miracle of what we all want, what we all aspire for.

Yet it's not just one night.

This is the power of technology that everybody should have access to.

That's my goal way.

Told you how.

Scientists said they don't rats to play hide and seek, can read to be taught to drive they can't reach the pedals in a Ford pickup.

But in a University of Richmond study, they were taught to drive.

These are, oh, Weise.

That's rat operated vehicles.

Their reward was Froot Loops, and they were found to be better drivers if they've been raised in a more stimulating environment, like a cage with toys, as opposed to a boring lab cage without them, the lab cage rats reportedly failed.

They're driving course.

They were accused of breaking the law by tailgating.

They had squeaky brakes.

They never yielded the rat away.

They always drove over the mouse of them.

Speed limit, and they struggled, making rat turns.

Seems the researchers ratted them out, and now they'll never pass.

The driver's passed of Carla zoos have a great weekend from all of us here at CNN.