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A "person of interest" has been taken into custody in connection with the string of arson-related fires in the city over recent days, including at least 12 more blazes overnight, our colleagues at KPCC report.

The station adds that:

As often happens with issues related to Iran's relations with the rest of the world, there's a mix of saber-rattling and diplomacy in the news again today:

Iran's navy said it test-fired a surface-to-surface cruise missile on Monday during a drill in international waters near the strategic Strait of Hormuz, the official IRNA news agency reported.

The missile, called Ghader, or Capable in Farsi, was described as an upgraded version of a missile that has been in service before. IRNA said the missile "successfully hit its intended target" during the drill.

Good morning.

With just one full day of campaigning left before Tuesday evening's Republican caucuses in Iowa — the first truly important contest of the 2012 presidential election season — the stories and headlines are all about who's up, who's down and who needs to do what to survive and do battle again next week in New Hampshire.

Transcript

STEVE INSKEEP, HOST:

If GOP front-runner Mitt Romney cannot quickly persuade his rivals and voters that he is the inevitable nominee and that further resistance is futile, he may be in for an expensive and time-consuming slog.

Unlike GOP presidential primary seasons of the past, the one that begins in Iowa Tuesday was actually designed to slow down the emergence of a winner by stretching out the calendar and altering the delegate allocation rules.

Sixteen years ago, a Swedish woman lost her wedding ring but she recently found it. A Swedish newspaper reports that while picking carrots in her garden, the woman found one with the gold band around it. She thinks it fell into some vegetable peelings meant for garden compost.

Foodies are obsessed with all things local and artisanal. But as the trend works through its inevitable life cycle, a bar manager in a hip East Los Angeles neighborhood is touting a cocktail program based entirely on California-produced spirits.

Millions of people are searching for things every day on Google. The people at the giant search engine realized that if they tracked those searches, the patterns can tell us about what's happening with people's lives.

ABC TV rolls out a new version of an old show Tuesday — this time its Celebrity Wife Swap. The old Wife Swap wasn't getting great ratings, so they needed to up their game. Eric Deggans, the TV and media critic for the Tampa Bay Times, explains what celebrities do for reality shows.

After concentrating on Iowa more than any other Republican presidential candidate, Rick Santorum is gaining on front-runners Mitt Romney and Ron Paul, a new Des Moines Register poll shows. Santorum is hoping to consolidate Iowa's Christian conservative vote — the strategy that won the state for former Arkansas Gov. Mike Huckabee four years ago.

Jeanne Zyzda did not expect more than 100 people in her Sioux City coffee shop, the Daily Grind. Not all at once, and not on a holiday.

Linda Wertheimer and Steve Inskeep have business news.

Steve Inskeep has the Last Word in business.

Concluding that he can win the Iowa caucuses, former Massachusetts Governor Mitt Romney spent the weekend campaigning in western Iowa, a mostly conservative region. After months of making only periodic visits to the state, Romney is making an aggressive final push through Iowa.

Transcript

LINDA WERTHEIMER, HOST:

Newt Gingrich says, when it comes to his campaigning, he has been conducting an experiment. The former House speaker says he's been running a positive campaign as he competes for the Republican nomination. And if voters who say they hate negative campaigning practice what they preach, Gingrich says he'll do better than expected in Iowa.

STEVE INSKEEP, HOST:

But Gingrich also says he needs to set the record straight, and that means firing back at Mitt Romney.

For generations of Japanese, smoking has been all but synonymous with manhood and hard work. During Japan's high-growth period in the 1960s, the smoking rate for males topped 80 percent, twice as high as the rate during America's smoking heyday.

In a country that's so tobacco friendly, it's no wonder anti-smoking initiatives have trouble gaining traction. That's despite the estimated $90 billion being spent on cigarette-related health costs and damages every year, three times what cigarette sales bring in annually, according to the Japan Health Economics Association.

Chinese leaders made a rare condolence visit to North Korea's embassy in Beijing last month.

Broadcast on China Central Television, the leaders – dressed in black suits — bowed in unison towards the portrait of Kim Jong Il. Why show so much respect to a man who had so much misery?

One reason: fear of something worse.

Companies making genetically modified animals face a regulatory morass in this country. It's not always clear which federal agency has responsibility for regulating a particular animal, and even when one agency does take the lead, the approval process can drag on for years.

The companies say this uncertainty means their technologies may die without ever being given a chance.

Take the case of the British company Oxitec. It has developed a genetically modified mosquito that the company says can be used to combat a disease called dengue.

On New Year's day in 1977, Lake Superior State University in Michigan released its first "List of Words Banished from the Queen's English for Misuse, Overuse and General Uselessness". Every year since then, it has taken nominations for words and phrases we should quit using in the coming year. Last year's list included such anti-favorites as "viral," "epic" and "refudiate."

In Washington, D.C., pedestrians nominated "ping me", "literally" used incorrectly, "bro," "hater," "hating," "totes" and "amazing."

As the new year gets under way, we take a quick temperature check on some key areas to see what the prognosis might be. The topics: politics — domestic and global — and economics.

The lecture is one of the oldest forms of education there is.

"Before printing someone would read the books to everybody who would copy them down," says Joe Redish, a physics professor at the University of Maryland.

But lecturing has never been an effective teaching technique and now that information is everywhere, some say it's a waste of time. Indeed, physicists have the data to prove it.

When Eric Mazur began teaching physics at Harvard, he started out teaching the same way he had been taught.

There's a handful of people — roughly 10 percent of the global population — that has something in common.

Many mysteries and misconceptions surround this group. Its members have been called artistically gifted and self-reliant, but also untrustworthy and insincere. Most recently, several of them have been called the president of the United States.

The new Broadway production of the musical On a Clear Day You Can See Forever has been billed as a "reincarnation" rather than a revival. The premise is the same as before: A psychiatrist, Mark Bruckner, falls in love with the "past life" of one of his hypnotized patients. But this version replaces Daisy, the charming young patient first played in the 1960s by Barbara Harris, with Davey — a gay man harboring a female alter ego deep in his subconscious.

About 430 years ago, Pope Gregory XIII gave the West a calendar which divided 365 days into what was to be called a "year." With 12 months and 7 days bundled into so-called "weeks," the Gregorian calendar was hailed as a marvel of medieval accuracy. We use it today, despite its occasional messiness — drifting days, leap years and 28-day months.

It's been only three days since the funeral for North Korean leader Kim Jong Il. In that time, his son, Kim Jung Un, has been elevated to the rank of supreme commander of the North Korean army. Meanwhile, North Korea has issued a series of scathing attacks on the government of South Korea. NPR's Mike Shuster reports it all looks like business as usual.