Tonight:

Rumours of war. An advisor to Israeli Prime Minister Benjamin Netanyahu addresses speculation that Canada cut off ties with Iran because of an impending attack.

Questioning questioning. An Alberta judge throws out the case against a Calgary woman -- and takes issue with the police's interrogation technique used to extract her confession.

An embarrassment of richness. When France's richest man seeks citizenship in Belgium, the press kicks off a nationwide kerfuffle.

Changing strategies mid-stream. Just days before a trial was to begin, a B.C. mining company admits it spent a century polluting Washington state's Columbia River.

Hoping the ends justify the meanness. I'll speak with the Canadian man who raised seven hundred thousand dollars for a bullied bus monitor -- and his grateful beneficiary.

And...by George, he thinks he's got it. A British mathematician adds to the body of research on one of the most pressing mysteries of our time: how exactly George Harrison created that ringing chord that kicks off "A Hard Day's Night".

As It Happens, the Tuesday edition. Radio that's starting to understand why his guitar gently wept.

There has been a lot of speculation over the past five days as to why the Canadian government decided to break its diplomatic relations with Iran, including closing the embassy in Tehran.

Many have suggested that it has to do with tensions between Iran and Israel. In fact, it is now being reported that some embassy staff are admitting they are happy to be out of Tehran, because they feared they would be taken hostage if there was an Israeli attack on Iran.

So the logic goes something like this: Our government supports Israel. And if Israel attacks Iran, Canada -- and Canadians -- become a target of Iranian reprisals.

Zalman Shoval is a foreign policy adviser to Prime Minister Benjamin Netanyahu, and was an adviser to former Prime Minister Ariel Sharon. He also served twice as Israel's Ambassador to the United States. Zalman Shoval is in Tel Aviv.

It's known as the "highway of tears."

Scores of girls and women have simply disappeared -- or been murdered -- along or near Highway Sixteen in northern British Columbia.

Now, one mayor along the road -- which connects Prince Rupert to Prince George -- is urging the provincial government to set up a shuttle bus that would operate along the seven-hundred-kilometre route.

Taylor Bachrach is the mayor of Smithers, B-C, which is about halfway along Highway Sixteen. He's made the proposal. We reached him there.

It was a bold headline -- the banner headline, in fact, across the front page of one of France's most widely circulated daily newspapers. As you'd imagine, the headline was in French. And I'm not about to give you the exact translation because that would involve me using language I can't legally use on the air. But a rough translation amounts to something like, "Take a hike, you rich hoser"

The newspaper, La Liberation -- known in France as "Lib-eh" -- printed the headline in response to billionaire Bernard Arnault asking for Belgian citizenship. And the way the paper figured it, Mr. Arnault might be trying to skip France's new super tax on the rich.

There's been a media frenzy ever since.

Mark Deen is a correspondent in Paris for Bloomberg.

If I had my way, each introduction I provide on "As It Happens" would be preceded by this:

That, of course, is the opening chord from The Beatles' "Hard Day's Night". It's so arresting -- the way it clangs, and then hangs in the air for a couple of seconds before John Lennon starts singing. It just grabs your ear.

And if you're an academic type, it also grabs your brain. Because that opening chord isn't just arresting -- it's perplexing. Forty-eight years after it was released, no one knows exactly which Beatle is playing what in those first seconds of "A Hard Day's Night". And now, the decades of frustration are pitting researcher against researcher.

Recently, Dr. Kevin Houston of the University of Leeds took on the mystery. He's a mathematician. Because when you're dissecting one of the great pop music enigmas of all time, you need to understand trigonometry and stuff.

Dr. Houston used software to divide up the various frequencies that make up that opening sound. Just for reference, here it is again:

Now, Dr. Houston says George Harrison is playing an F chord add nine, combined with the low E string, on a twelve-string Rickenbacker. And John Lennon is simultaneously playing the same chord on an acoustic guitar. And there you have it.

Except Dr. Houston's not the first one to attempt to reduce that chord into its component parts. He's not even the first mathematician.

In 2004, Jason Brown of Dalhousie University conducted his own research. And he spoke with former "As It Happens" host Mary Lou Finlay about what he'd discovered. Here's part of that conversation, from our archives.

Christa Chapple said she didn't do it. She said she wanted to remain silent, on the advice of her lawyer. But the Calgary police officer interrogating her about a child who was injured at Ms. Chapple's home daycare persisted -- for eight hours. Finally, she said what the police wanted to hear -- that she did it.

Now a judge in Alberta has all but dismissed the charges against Ms. Chapple. And he's strongly denounced the police interrogation method used against her -- a method called the Reid technique.

Willie deWit is Ms. Chapple's lawyer. We reached him in Calgary.

The good news is that Tropical Storm Leslie wasn't nearly as bad as Hurricane Igor. The bad news is, Leslie still packed a wallop.

Leslie ripped through Newfoundland early this morning, tearing off roofs and siding, and taking a few power lines down along the way. By the afternoon, Leslie was gone, with nary a backward glance, as she headed out over the Altantic.

The storm was more about the wind and luckily, it didn't include the expected heavy rains.

Garry Kirby in Conception Bay South had to watch as Leslie uprooted a tree his father planted back in 1963. Here he is describing the scene to the CBC's Mark Quinn.

It was an ugly incident captured on video.

Karen Klein, a sixty-eight-year-old grandmother, was tormented, relentlessly bullied by a group of boys while working as a school bus monitor in upstate New York. The video went viral on YouTube, infuriating millions of viewers -- and moving one Toronto man to action.

Max Sidorov started an online campaign to raise money, to sent Ms. Klein on a vacation. We spoke to Max Sidorov in June, when he first started his online campaign -- a campaign that soon went viral on its own. And today, thanks to Mr. Sidorov, the bullied school bus monitor from Greece, New York, received a cheque for seven hundred thousand dollars.

Karen Klein and Max Sidorov spoke to us in our studio in Toronto.

Some call him "Captain Zero" -- while others say he's a local hero.

Lynden Dorval is a physics teacher at Ross Sheppard High School in Edmonton. And he may be about to lose his job -- because he gave zeroes to students who didn't compelte their assignments. Which is a problem because the school has a no-zero policy.

Yesterday we spoke with Mr. Dorval. He'd just attended a hearing with the Superintendent of the Edmonton School Board about his possible termination.

And then Talkback offered its report card.

First a giant wave capsized their fishing boat -- throwing Ryan Harris and Stonie Huffman into the frigid Alaskan waters. Then their boat sank. And no mayday had been sent.

Mr. Harris clung to a small plastic fish bucket. Mr. Huffman struggled to get into a survival suit before he succumbed to hypothermia. Neither man was certain of the other's fate.

When they failed to return home, a search-and-rescue team was dispatched.

Mr. Huffman was found on a beach several miles away in good health. And Mr. Harris bobbed on the waves, inside the bucket, for twenty-six hours before he was finally spotted by a helicopter.

After his rescue on Saturday, he told a reporter from the Daily Sitka Sentinel that he kept his spirits up by singing "Rudolf the Red-Nosed Reindeer" and "Row, Row, Row Your Boat."

So, for Ryan Harris, here's "Row Your Boat" by the Charles Clark and Willie Dixon Band.

If you look at a work of modern art and think "a child could do that," well, a lot of people might object to that.

But if you think the same thing when you see a curator explaining to gallery visitors what all those smudges and lines mean, you're right.

At New York's Museum of Modern Art -- or MoMA, children are doing exactly that -- through audioguide tours recorded by an non-profit organization called Audio Tour Hack.

The series, which is called "MoMA Unadulterated", wasn't authorized by the museum. But the group behind this project says it hopes the tours will bring more people to the gallery and reinvigorate children's love of art.

Here what kids -- ages three to ten -- have to say about Barnett Newman's "Vir Heroicus Sublimis." It's also our Sound of the Day.

It was a long-awaited admission.

Yesterday, Vancouver-based company Teck Resources acknowledged that hazardous waste from its Trail, BC plant has been leaching into the Columbia River in Washington State. Teck says the pollution took place for an entire century -- from 1896 to 1995.

Teck is a mining and minerals company. And for the past eight years, Teck has been in a legal battle with the State of Washington and the Colville Confederated Tribes situated along the Columbia River. The company's admission comes just days before a trial was to begin.

Jani Gilbert is a spokesperson for the Washington State Department of Ecology. We reached her in Spokane.

And now for something completely different.

Last week, Monty Python's Graham Chapman was honoured with a blue plaque. Blue plaques are often put on the homes of the UK's most famous deceased. But in a slight twist, Mr. Chapman's plaque was put on his home away from home: the Angel Pub in the Highgate area of North London.

The plaque calls Mr Chapman "a very naughty boy", in a nod to the famous line in the film "Monty Python's Life of Brian". And it also says "he drank here often and copiously".

Comedians, colleagues and former Pythons gathered for the unveiling. And fellow Python Michael Palin had these fond words to say about his late friend. Quote: "I spent many times with him, most of which I forget. Highgate was his patch and he should be celebrated because he was a very good, brilliant, funny, nice, wise, kind man, who occasionally drank too much."

Others agreed. Graham Chapman's former colleague, comedian Barry Cryer, said, "I think the pub is the perfect place to put the plaque. Very Graham, very silly."

Well, we don't have a blue plaque to celebrate Graham Chapman. But we do have something silly.

The conflict in Syria is changing.

With pitched street battles now being fought every day in the northern city of Aleppo, the government is facing a rebellion that is better-organized and better-equipped than ever before.

But the opposition appears to be changing in other ways as well.

Dr. Jacques Beres -- the co-founder of Medecins Sans Frontieres -- has been in and out of Syria over the past year working in underground emergency clinics. He's just returned from the city of Aleppo. We reached him in Paris.

Dateline, Rochester, New York.

Most of us have done it: pushed a yellow traffic light a little too far, and crossed an intersection as it turned red. And if we happen to live in a place where red-light cameras are used, we pay a fine for our aggressive driving.

Unless you're a municipal employee in Rochester.

There, it's been revealed that city employees driving cars on municipal business simply don't have to pay the fines, as a matter of policy.

And we're not talking about police cars or ambulances or fire trucks -- which are, of course, allowed to drive through red lights. Although the city's police chief was ticketed running a red light in a non-emergency situation.

So were cars driven by waste department workers, cemetery workers, and library staff. None of whom had to pay those tickets.

This has some folks in the upstate New York town, well, uptight. Especially because, if a regular resident doesn't pay the fifty-dollar fine, the city launches a court-ordered collection process.

Which has some suggesting that the city stop giving its employees a break -- when they don't apply the brake.

It was a case of nature versus machine this weekend near Thunder Bay, Ontario.

Tom Lanos was getting ready to head back home after a weekend at his cottage at Hare Lake, east of Thunder Bay. But when he got back to his SUV, he noticed that it didn't quite look like it had when he left it.

This morning Mr. Lanos spoke with Lisa Laco on the CBC Radio program "Superior Morning" about his vehicle's unfortunate, intimate encounter with the wild kingdom. Here is some of their conversation...for the record.

It's been nearly thirty-two years since Led Zeppelin broke up. But even after all that time, it only takes a single word to start millions of fans frothing at the mouth. And that word is "Five".

On Saturday, that word appeared on the band's official Facebook page. Just a big image of the word "Five", written in a stylized, Led Zeppelin-style script. That word accrued more than thirty-seven thousand "Likes", and more than twenty-five hundred comments. By contrast, I once posted a picture of a truly delicious banana bread I'd made on Facebook, and I got no "Likes", and one comment from a woman I knew in high school. It said, "Looks good!"

Back to Led Zeppelin: the next day, some clarification arrived, with a second Facebook post: the word "Four". Suggesting some sort of countdown. Some fans -- despite all the facts at their disposal -- expressed the opinion that Led Zeppelin is about to officially reunite and tour. Others speculated that it's a countdown to the release of a DVD of the band's 2007 shows -- a reunion they played in honour of the late founder of Atlantic Records, Ahmet Ertegun. And still others just took the opportunity to comment, "Zep Rules!"

You can probably infer that yesterday's post read "Three", and today's reads "Two". Which confirms it's just some kind of marketing or publicity stunt. But from another angle, it's the story of dedicated fans. They'll take anything they can get from their favourite band -- and Led Zeppelin's got their number.